whats the best opening for black or white to get above 1500Elo?
You mainly play rapid and your rating is about 650.
I think you still need to work on basic opening principles and development. Look at your last game:
You won in the end but you were lost almost immediately. You should learn the basic moves against the Englund Gambit. You undoubtedly face it a lot. You really need to take the e pawn.