First couple of orbits try and get a few reads on each of the other players - who limps a lot, who raises too much, who flats 3bets OOP and folds flops, etc. Then use that to slowly chip up without showdowns, abusing limps and weak raises and taking down as many pots as you can as cheaply as possible. Live players are far less aware of pot sizes so you can change your bet sizing hugely and bet big when you want calls and much smaller when you are bluffing
for the same effect. Pick on the weak players and not on the better ones if you can, as they will be less likely to play back.
If you start getting to 25bb or so tighten up, choose your stealing spots more carefully and choose spots to 3bet jam over looser players - you'll be amazed what respect you can get jamming only 20bb against tighter players too. If you don't drop down to 25bb and keep a decent stack sizes while other people do have short stacks, steal a lot if there are antes in play.
At 15bb or so never raise/fold when stealing, only raise call or jam all if you want extra fold equity with weaker hands or if it makes the hand a lot easier to play (AQ for example). Also be aware of blind levels; you may have 19bb and think about raise folding now, but if blinds are about to jump big in 2 minutes then it's not a good spot.
Essentially steal wide and value bet big