If the blinds double every time, imo it pay dividends to take a small ball approach early and try and build a stack early. This is because you go from being very deep-stacked and comfortable, to being short-stacked and desperate. Inevitably it will turn into a average stack of 10-15bb's where it'll devolve into shove, shove, shove. If it is a slow structure, you can play tighter and ABC and probably be good. In general focus on valuebetting more and bluffing a lot less. If your table gets 4-7-handed open your range up, most live players (even semi-competent ones) play their full-ring style no matter how many people are at the table.
Good tells and player traits to look for:
Who plays their draws aggressively?
Which players will call w/ 2nd or bottom pair looking to spike 2pair and how do they play it on the river.
Who overplays their hands like JJ and AK
Also, this is extremely general, but players who call in the blinds and then raise a cbet on the flop almost always have 2pair (I swear on this for LLSNL)
Also, Zynga Wizards limp/raising is the stone cold nuts like 99% of the time