For those who are their own beta reader/don’t have a beta, what resources or methods do you use to shape up your fics?

I’ve semi-recently gotten into publishing my fanfic writings, and even after I read over it multiple times, I still catch errors I missed (lol). What resources do you guys use to catch those sneaky little mistake if not just constant re-reading?

Also is it wrong to something ask ChatGPT to help me rephrase my sentences? I sometimes tend to be wordy and it helps me with concision. I also sometimes use the program to check if my characters are coming off the way I want them to.