You should be in push or fold mode.
Push big hands in all position 66-AA, AK, AQ, AJ, KQ, KJ,
Fold all other hands.
Position is still v. important and unless Im severely SS (less than 5BB) I wont push hands like Q10, QJ, J10, etc UTG. If im the first to open in mid position, then I'll go all in with these hands + big hands. As well as suited connectors and any Ax suited hands.
Go all in on the button when its folded to you with ATC. Go all in when you are the SB and only have the BB behind you. Go all in when you are the BB and the SB limps.
Sometimes, when you are so shortstack, you just have to constantly push and hope for the best.