Welcome to BTP! Good to see some fresh faces.
Looks like you got the early game down good.
Middle game is very tough to summarize. If you have a slightly larger than average stack, you want to continue playing tight. What exactly to do depends on the stacks, players remaining, blinds, your hand, and their hand ranges. Post a few specific examples and I'll give you a better response. When your stack is somewhere floating around the average stack, you should NOT attempt blind-steals unless you have 12x BB or less and it's a +EV shove situation. I'll give an example:
6 players remaining
50/100 blinds
You have a stack of 1400.
Folds to you in MP (right before CO). You hold
.
Raising to 300 would leave you with 1100 chips remaining, and if someone calls your raise (def not uncommon with donk-n-go players), the pot will be around 650.
Folds to the BB, and he calls your raise.
The flop comes
BB checks and you c/b for 400
You now have 700 chips remaining
BB moves all-in. The pot is huge but you're probably behind and don't know which outs are clean. You fold.
You've now gone from a relatively healthy 14x stack to 7x in the course of blind-stealing with one marginal hand.
This is a fairly common situation in the middle game. Lay off the blind stealing when you have a moderately healthy stack. When you're bigger stacked you can afford to run over the table a little more (don't get carried away obv, but def open-raise QJs there).
I hope that helped somewhat. Post some specific examples you've had where you were unsure of your play.