My handwriting was garbage in middle school to the point where my teachers made me stay after and rewrite my essays unfortunately and of course I got bad scores due to my handwriting for exams as well. I mean it took a lot of dedication for me to 'fix' my handwriting to be at all legible. I got much better towards the end of highschool, but for some funny reason my writing grew smaller as well.
I did write in all caps one year because I was taking a tech career class (which I enjoyed immensely) and everything I read in there was in caps, so I kind of...ended up writing with all caps.