Without a doubt I suggest you stay at Clemson.
– I remember a call from my son about this time in his freshman year worried that he will never find another friend like his HS BFF. Months later he had more friends from college than he ever had in HS and a number of them are his very close friends years after graduation. It takes time to find the people you mesh with and to cultivate meaningful friendships, shared memories etc… The frat may prove to be really good socially. Be patient – things may take even longer than usual in this time of covid.
–Your friends are not on a great path at their college. No reason to let them drag you down.
—College basically consists of two 14 (or so) week semesters a year. You will have plenty of time to see your HS friends during breaks, in the summer etc. And technology should allow you to stay in touch during the school year.