I stopped my Spanish learning on Duolingo and I switched to the Spanish Dictionary app to continue learning.

BThe reason was because Spanish Dictionary provides lots of flash cards to memorize vocabulary and this review process is more effective to me.

When I was using Duolingo, I usually only spent 20 minutes on it.

And the review processactivities were not enough to memorize the words I had learned.

When using the flash cards review mechanism, I will learn 20 new cards every day and t. The review time is calculated by their algorithm, and they allow reviews for hundreds of words, if possible for, in one day.

Their algorithm uses spaced reviews to make sure the 20 words I learn every day will be reviewed on time so I can keep good retention of vocabulary.

There is a specific tool for this spaced reviews memorizing method, which is called Anki.

Now I use You Dao dictionary to collect my English vocabulary list, Spanish Dictionary to collect my Spanish vocabulary list, and Anki to memorize some information like the capitals of all the countries in the world.

This animation series provide muchhas a lot of humor so it’s interesting to watch it.

And I continued to watchread the Assassin’s Blade, a teenager fantasy novel.

These two comprehensiveble, interesting sources of inputs help my English listening and reading skills.

I just accept doing nothing and meantimes do more things makes me feel good.

Sorry, I am not sure what you are trying to say in the second part of this sentence.

I am open to things happening randomly oin my surroundings and, observe my feelings about them, and follow the feelingurges to do something.

I stopped my Spanish learning on Duolingo and I switched to the Spanish Dictionary app to continue.

Because Spanish Dictionary provides lots of flash cards to memorize vocabulary and this review process is more effective to me.

Here I have 2 suggestions. Link the first sentence to this one, like this: "I stopped my Spanish learning on Duolingo and I switched to the Spanish Dictionary app to continue, because Spanish Dictionary provides lots of flash cards to memorize vocabulary and this review process is more effective to me." The "because ..." sentence is incomplete by itself. Another way you could do it is to keep this by itself, and just remove because: "Spanish Dictionary provides lots of flash cards to memorize vocabulary and this review process is more effective to me."
However the first option would be more common to use.

And the review processes were not enough to memorize the words I had learned.

Same issue as the prior sentence. This sentence is incomplete by itself. I would link it to the previous sentence: "When using Duolingo, I usually only spent 20 minutes on it, and the review processes were not enough to memorize the words I had learned."

When using the flash cards review mechanism, I will learn 20 new cards every day and, the review time is calculated by their algorithm, and they allow reviews for hundreds of words if possible for one day.

Their algorithm uses spaced reviews to make sure the 20 words I learn every day will be reviewed on time so I can keep a good retention of vocabulary.

This animation series provide muchs a lot of humor so it’s interesting to watch it.

And I continued to watch the Assassin’s Blade, a teenager fantasy novel.

Again, link to the previous sentence, cannot stand on its own.

I just accept doing nothing and in the meantimes do more things that makes me feel good.

I am open to things happening randomly oin my surroundings and, observe my feelings about them, and follow the feelings to do something.

things happening -> things is plural, so it must be happenings not happen