I think mixing up your play is fine but if your opponents are bad, they will not have observed your playing style, let alone if you are mixing it up. In that regard, you won't ever be exploited if you always 3 bet KK here in this level.
I think river is a clear fold (even before the results were shown). Ax is the most overplayed hand and CS will call down with A high quite a high % of the time. Also a river bet is a very strong play given the villian and you cannot beat most of his range.
I wouldn't be too worried about the result -> this was a hand you were bound to lose. I would be more concerned about playing "correct" in each street
theres a common problem with passive calling stations.. as soon as they get active, they got some nice hand with showdown value and most of the time have outdrawn you. build the pot much much earlier, i overbet every single street against calling stations to maximize my EV against them. slowplaying this is not a good idea. playing good hands straight forward against donks is the best way. as played, tough decision as many players also cant fold AK and like to float with it. most of the time he as a Q or an Ace, betting busted flushdraws is not what microlimit players do.
