Q1: Something like ~450ish. Your range is very polarized when you 3-bet here, and your sizing should be larger to reflect that. It also helps you get max value from what seems to be two weak players.

Q2: Pretty much all pairs 22-JJ, most broadways, suited Ax, suited connectors, maybe some offsuit Ax. People with high VPIPs will continue with anything that looks pretty in these spots.

Side note: I like that you stopped using “donk bet”! Good stuff.

Q3: Jam all-in, all day every day. Both players have ranges that are simply too wide for you to assume you’re behind with a high frequency here, and the flop is too dynamic for you to call and see a turn card. Getting it in allows you to maximize value against worse hands, while denying the free card to draws and simplifying your decisions massively. Your opponent has leveraged your entire stack with this bet, so you should be playing all-in or fold poker once that bet size goes out there.

Q4: There are a lot of things you could ask yourself, but the most important thing is that reviewing hands needs to be a dialogue – if it’s just you looking at a hand and thinking about it, nothing is really happening. It needs to be either a dialogue between yourself and another player, or between yourself and a piece of software that can give you some feedback on the mathematical nature of the situation. Otherwise you risk getting stuck in an echo chamber of your own existing knowledge, which is what happens to most players.

Essentially, if you’re asking yourself questions that you can easily answer, all you’re doing is reinforcing what’s already there. That’s useful at times, but in order to push your game forward, you need to go looking for answers you don’t already have. If your process for thinking through a hand becomes a question-and-answer game in real-time, eventually something will trip you up by breaking the chain and leaving you without an answer, so rather than asking “what should I ask myself?”, think about what you currently would normally ask yourself and consider whether you’re fully confident in your ability to answer those questions. If not, adding more questions is only going to make life harder.