New into this site, let's see if it couldan help me

"New to" is the normal collocation for something you are entering for the first time.

"Could" is normally used as the past form of "can", in this context you expect something from the future use of LangCorrect so we have to use the non past form, which is "can".

I just found this website and I really saw itthought it looked interesting, because I still make mistakes when I write in English, and I also I still make mistakes when I talk in English too hahaha but let's give it a shot toand see if it couldan help me to finally learn where and when I madke the mistakes.

Web = the entire internet
Site = the single page

"looks interesting" is a phrase, you can of course change the tense i.e. "looked interesting".

Although I didn't put it because I didn't want to change your original too much this part:
"...I still make mistakes when I write in English, and I also still make mistakes when I talk in English too..."

Has a lot of repetition, it would be easier to read in a slightly different form, like:

".. I still make mistakes when talking and writing in English..."

or

"... I still make mistakes when I talk and write in English..."

I little history about me, Im from South America but now imI livinge in Spain, I gothave been here for about 4 and a half years already.

Here in Spain, there a lot of people who talk in English, but I am still get scare to maked of making a mistake that, so I don't talk, I want to get better inimprove my English vocabulary but also I don't read in English because imI read too slow readingly, could someone recommends me books that were easy to read to get some vocabulary.

Read teenagers literature or something you have read in Spanish. The only way to speed up is by doing it more. My rule is to read the first 5 pages of a book, if I have more than 10 new words per page I look for something easier, or I take my time a read one page a day.

One of may purposes this year was to go out to meet ups or bars where people share their knowledge or want to learn Spanish, but then it came the quarantine, so I geot fucked, because then I didn't want to do anything.

Well there iat's a little about me and I hope you guys have mercy when send o do the corrections hahaha im just kidding.