A guy has been stalking/ harassing me for so long, and idk what to do.

For context, this guy has been one of my classmates. He has been persistent to date me from class 6th onwards. ( i have now passed class 12) You do the math. i didnt take it that seriously the first few years, since we were both kids. after that, during lockdown, he sent me many msgs and when i blocked him he kept on creating new accounts ( probably 30 new accs, all blocked now). he created account, followed only my public account, and sent req to my private. to add the cherry on top, he had a different name everytime. but i figured it out regardless. Even in school, he found ways to talk to me and just propose to me etc. Even tho i said i am not intrested at all( from class 6th i have been telling NO). On scribble day (last day where students write on each others shirts) he kept on begging me to write on my shirt. i kept saying no but he was so persistent. he only went when my friends shooed him away. now after some time, he again created that account. I am so sick and tired of this. idk what to do.

ive shared with my parents. they said block him and ive done that every time.