I've been procrastinated oning most of the things I want to do.:

Practicing English and Spanish, organiseding my photos, editing videos, exercising etc.

Connect to previous sentence with colon or ", like/such as". Also will assume British English because of how you spelled organise.

Last Saturday, I participated in an event and was truly inspired by some people.

Technically correct but usually a sentence would describe the event and the people you were inspired by. For example, "Last Saturday, I attended a lecture and was truly inspired by some of the speakers."

There was a man, who was thea professor in theat a university.

But hHe was not only a professor, he was but a lot of other things too.

I would connect this to the previous sentence and the next: "There was a man/lecturer/speaker who was not only a university professor, but also the ambassador ..."

He was the ambassador into the UK, he was.K., the co-founder of TED x Taipei, he was the founder of somea few charity organisations, the was the schoolcoach of the Cambridge table tennis team in Cambridge, he, played a role in a famous Taiwanese TV show, and a lot more of himmuch more.

If you know that he has founded 5+ charity organizations you can say "several," which is formal enough for this type of writing, otherwise I would avoid some/a few entirely and say "had founded charity organizations," otherwise it seems rather informal.

Also, usually you need to indicate both countries when talking about an ambassador, e.g. "he was the ambassador from China to the U.K." or "he was the ambassador to the U.K. from China."

I was very impressed by all the things he was doinghis career.

"All the things he was doing" alludes to the things he was doing at the event, not his career. Also could say "impressed by all the things he has done/his accomplishments impressed me."

He must be so busy with his works already, yet, he still chooses to participated in so many different activititake on so many roles.

"Participate in activities" is very abstract/generalized, it's good to be as specific as you can, which can be challenging when describing someone who does so much.

I kneow that I could have been doing a lot more with my time, but most of the time, I just ended up watching Netflix at home.

I decided to make some changes, step by step, starting today.

My friend has introduced me to this website to me a while ago, but I never took any action to signed up.

He sent me a link to his journal detailing his perspective of the event same day, and I decided to start from thisere.

I signed up to Langcorrect and wriote my first ever journal.

WhileI think writing, I think thi journals is a very good way to not only for practicingse languages but also to organised my thoughts and keep track of things happening in my life.

Something to watch out for in British English: "practise" as a verb is spelled with an s, but the noun (such as when referring to a doctor's clinic as a practice) is spelled with a c. The spelling may have evolved/your teacher might dictate that it's always spelled with a c, but just in case.

I don't know for how long I wouldill stick towith it, but I'm glad I've started now.

I've been procrastinateding on most of the things I want to do.

"procrastinating on" makes sense and I can find examples of people using it, so I haven't changed it. But the only usage I'm confident is correct is to say "I've been procrasinating a lot lately", or something like that. We usually just use the verb alone, without specifying what it is that we aren't doing.

Practicing English and Spanish, organiseding my photos, editing videos, exercising, etc.

It looks very colloquial to use "etc" without a comma here.

There was a man, who was thea professor inat the university.

You'd say "he was the professor" here if the university only had one professor.

He was the ambassador into the UK, he was the cofounder of TED x Taipei, he was the founder of some charity organisations, he was on the school table tennis team in Cambridge, he played a role in a famous Taiwanese TV show, and a lot more of himmuch more.

I was very impressed by all the things he was doing.

"was doing" is okay here if you want to specifically draw attention to how he's doing these things *now*, they're still part of his life - I'm not sure if you do, so maybe "all the things he did" would be better. Many tenses would be appropriate here, actually.

He must be so busy with his works already, yet, he chose to participated in so many different activities.

"to participate" is the to-infinitive, so it never gets changed. We never say "to participates" or "to participating" or "to participated" (unless the "to" is a preposition).

"works" is okay but "work" is a lot more natural in this usage.

I knew that I could have been doing a lot more, but most of the time, I just ended up watching Netflix at home.

Would be more natural to have this all in present tense. "I know I could do a lot more, but I end up watching Netflix." You've decided to make the change, but if you only started today then it probably isn't a "complete" change, you know? But this is okay.

My friend has introduced this website to me a while ago but I never took any action to sign up.

You'd use "has introduced" if the introduction was still sort of in the present. Difficult to explain. But if he did it "a while ago" and there was a break where took no action until now, it feels best for this to be simple past tense.

He sent me a link to his journal of the event on the same day and I decided to start frombecause of this.

There were a couple of different things you could have meant here, so I'm not sure if this is correct.

I signed up to Langcorrect and now I write my first ever journal.

While writing, I think this is a very good way not only forto practicinge languages but also to organised my thoughts and keep track of things happening in my life.

I don't know for how long I wouldill stick to it, but I'm glad I've started now.

"would" would be used here if the situation was hypothetical - you hadn't started writing yet. Now that you have started writing, it's "will" :)