I have been persevering in speaking practice on Episonden, so I write less daihave been writing fewer diary entryies than before. I have been persevering in speaking practice on Episonden, so I have been writing fewer diary entries than before.

"Fewer" is for items that are countable. "Less" is for items we measure instead of count. Fewer words, entries, corrections. Less sugar, snow, time. "Dairy" is a typo but also a different word. As you probably know, it means "milk product." Although the original verb tense "I write" is not wrong, I think it is more natural to use the same verb tense for both actions.

On Episonden, I can practice speaking with strangers bythrough several minutes of video calls. On Episonden, I can practice speaking with strangers through several minutes of video calls.

On Episonden, I can practice speaking with strangers bythrough video calls of several minutes video calls. On Episonden, I can practice speaking with strangers through video calls of several minutes.

Also good: "several minutes long."

Usually, we can't understand each other very clearly, but we can get the general meaning of what each other is saying. Usually, we can't understand each other very clearly, but we can get the general meaning of what each other is saying.

Good use of the comma to separate the two independent clauses!

Looking back, most people I met there are Filipino and Indian. Looking back, most people I met there are Filipino and Indian.

A more advanced term for "looking back" is "in retrospect." (The etymology reminds me of looking in a car rearview mirror because "retro" means "back" and spect "to look.")

I think the reason is that we are in similar time zones. I think the reason is that we are in similar time zones.

I think the reason is we are in similar time zones. I think the reason is we are in similar time zones.

Also good: "that we are"

I am striving to look for an English speaking environment because environmenit is really important for language learning. I am striving to look for an English speaking environment because it is really important for language learning.

I am striving to looking for an good English speaking environment because environment is really important for language learning. I am looking for a good English speaking environment because environment is really important for language learning.

The meaning is a little confusing in your sentence. On the one hand, the Episonden platform IS an English speaking environment, so you have already found one. On the other hand, it isn't ideal because it's hard for you and your speaking partners to understand each other. I tried to correct the sentence so that it wouldn't have a contradiction. Another option might be: "The reason I'm looking for a good English speaking environment is because environment is really important for language learning."