Hello! on top of BacardiShots' point, I would like to ask how many tables do you usually play? Because it is highly possible you play fit-or-fold. Now if you do play, say 6-tables, try cutting down to 4 tables max. Now, focusing on your blind play, card values are negligible here:
Blinds in theory need stronger hands to play properly due to the positional disadvantage. In practice, it still holds with a little twist, you can bluff more especially those who like to steal a lot. Since you play really tight, they will give you more credit if you 3bet bluff those blindsteal attempts. Do not overdo it though, but the important thing is take note of how they respond.
Folded to you in the SB:
does BB fold to 2x open? How about 2.5 or 3-3.5x? If he plays, does he call more or 3bet more? If he 3bets, does he 3bet 3x or more?
SB opens with you in BB:
if you call, how frequently he cbets? If you 3bet, does he fold or call more often.
Some ideas to get you started, good luck and cheers