How do I get a summer internship with a decent pay?

Tier 1 IIT circuital branch with average cg(~7.5). Applied on campus but got rejected in 7 interviews after passing the OAs till now. Our dumbass HOD won't allow us to go on semester internships and more than half the roles we are getting on campus are sem interns. Lost hope for on campus, tried applying on LinkedIn but didn't get any replies till now. So, how do I apply for one?