Hello Dear Diary, Today I made a to-do list whicof things that I hope to accomplish before the end of this year. Dear Diary, Today I made a to-do list of things that I hope to accomplish before the end of this year

Just some minor touch-ups

Hello Dear Diary, Today, I made a to-do list whichto complete before the end of this year. Dear Diary, Today, I made a to-do list to complete before the end of this year.

"Dear" is used as a greeting so you'd have either "Hello diary" or "Dear diary" but it doesn't make sense to have both; it'd be like saying "Hello hello diary"

Hello Dear Diary, Today I made a to-do list which I want to complete before the end of this year. Hello Dear Diary, Today I made a to-do list which I want to complete before the end of this year.

And of course it has started with—with the first one being to practice speaking eEnglish. —with the first one being to practice speaking English

I attempted to connect your two sentences to make them sound more natural

And , of course, it has starteds with speaking eEnglish. And, of course, it starts with speaking English.

And of course it has started with speaking english. And of course it started with speaking english.

So—and I have but 119 days left. —and I have but 119 days left.

I don't think that very many natives would speak like this, however the sentence is redeemable if you add a literary flourish.

So, I have 119 days left. So, I have 119 days left.

I don't have idea how can I improve my eEnglish, but I will try. I don't have idea how can I improve my English, but I will try.

As a proper noun, "English" should be capitalized. There also needs to be a comma to separate parts A and B of a contrasting sentence (A, but B)

I don't have no idea how can I improve my eEnglish but I will try. I have no idea how can I improve my English but I will try.

People say that you shouldOthers usually recommend practicing reading, writing, and speaking. as though it is altogether simple Others usually recommend practicing reading, writing, and speaking as though it is altogether simple

People say that you should reading, writinge and speaking. People say that you should read, write and speak.

People say that you should practice reading, writing and speaking. People say that you should practice reading, writing and speaking.

But this situation is not easy as they say especially for me—but while there is merit to what they say, I wonder if those reciting these rote statements truly understand how difficult this process truly is. —but while there is merit to what they say, I wonder if those reciting these rote statements truly understand how difficult this process truly is.

I would have personally deleted both this line and the last one, but I decided to preserve them to provide you with experience for how such a sentence could ~theoretically~ be made to work if one day you needed to use similar words in another situation.

But this situation is not as easy as they sayit seems, especially for me. But this is not as easy as it seems, especially for me.

If only I could describe how much hardship I'The difficulties that I have endured up to now. are indescribable, The difficulties that I have endured up to now are indescribable,

Your sentence was grammatically correct, but felt somewhat disconnected from the rest of your post.

Buthowever I will forget everything and begin to my new lifeset aside the past and move onward toward the future, starting with my to-do list. however I will set aside the past and move onward toward the future, starting with my list.

Just some more touch-ups

But I will forget everything and begin to my new life with my to-do list. But I will forget everything and begin my new life with my to-do list.

But I will forget everything and begin to my new life with my to-do list. But I will forget everything and begin my new life with my to-do list.