I have switched everything to privacy alternatives is it safe to delete my Google account or is it needed for some android features also if I delete my account does Google delete all my data if not, can I request the deletion of my data under the GDPR
Depends on your phone’s ROM. What are you running?
default hyperos rom sadly no rom for my phone since mediatek
I would try removing your Google account from the phone in settings and see what happens (before you delete the account). If you can survive with the results, go for it!