I'll be honest. I don't have my pronouns in my bio because I don't really mind what I do get referred to as (well, maybe with 'it' being an exception -- feels disrespectful ngl). I don't like to give off too much information about myself right off the bat.
[...]

Some know for certain, some may not. I'm fine with that.
*Not everyone* is as lax as I am regarding that, though. Especially trans folks, for the *right reasons*. So, information regarding that in the next tweet in this thread and I do ask to have a read..
[...]

- If someone has their pronouns in their bio, location, or sticky, go with that (respect it -- really not that hard)
- If you don't know, use English *properly* and don't assume while you don't know for certain (don't think like a legal document that keeps mentioning 'he')
[...]

- Ask
- If corrected with preferred pronouns, respect and go with it

I found that some end up taking more effort to defend their stance being to decide for themselves how they should refer to others as if it's factual and those being referred to don't know themselves.
[...]

English not being your first language (especially if there is no neutral grammatical gender) is not great of an excuse. I've seen many who still got it right. Could be because it was something that some had to get used to after a while. As long as you learn, it's not an issue.