Hello, it's my first try to write something on here. Hello, it's my first try to write something on here.

Hello, it's my first trying to write something here. Hello, it's my first trying to write something here.

Hello, it'this is my first try toattempt at writeing something here. Hello, this is my first attempt at writing something here.

This sounds more natural to me - attempt instead of try.

Hello, it's my first tryime to write something here. Hello, it's my first time to write something here.

Hello, it's my first tryattempt to write something here. Hello, it's my first attempt to write something here.

I wanna improve my eEnglish. I wanna improve my English.

Just keep in mind "wanna" is a very casual word. It's good for texting or social media, but avoid it in formal writing like essays or emails.

I wannat to improve my english. I want to improve my english.

Your way was also OK for being informal

I wannat to improve my eEnglish. I want to improve my English.

English should be capitalised.

I wanna improve my eEnglish. I wanna improve my English.

I wannat to improve my eEnglish. I want to improve my English

I'm sorry for my stupid mistakes in this text. I'm sorry for my stupid mistakes in this text.

I don't know how dto work this platform, but I think I'll understand eventually. I don't know how to work this platform, but I think I'll understand eventually.

I don't know how dto work this platform, but I think I'll begin to understand. I don't know how to work this platform, but I think I'll begin to understand.

I don't know how do work this platform, but I think I'll understand it eventually. I don't know how do work this platform, but I think I'll understand it eventually.

I don't know how dto workuse this platform, but I think I'll understand. I don't know how to use this platform, but I think I'll understand.

I don't know how do work this platform, but I think I'll understandfigure it out. I don't know how do work this platform, but I think I'll figure it out.

My eEnglish is very bad, but tryna do something with it. My English is very bad, but tryna do something with it.

Same with tryna - it's a very casual word. It's fine to use in these journal entries but avoid it if you want to write emails or essays in English.

My english is very bad, but trynaing to do something with it. My english is very bad, but trying to do something with it.

Your was was OK too

My eEnglish is very bad, but trynaI'm trying to do something withto improve it. My English is very bad, but I'm trying to do something to improve it.

My eEnglish is very bad, but I want to tryna to do something withabout it. My English is very bad, but I want to try to do something about it.

My eEnglish is very bad, but tryna do something withI’m trying improve it. My English is very bad, but I’m trying improve it.