Do you have any stats on player 4? As default if I intend to 3bet TT against a 70bb stack (I assume he is a fish), if 4bet I'd be getting stacks in pre flop. You should ask yourself if you're willing to do the same, if not then just flat their open.

As played the flop is an easy c-f.

Stats here would be great. As a default I'm either shoving or calling preflop unless villain is suuuuuuper nitty. Lean more towards shoving the looser villain is. Once you get to the flop, yeah not much else to do but fold. TT will do fine on a lot of textures but this is not one of them.

I'd want to know what kind of fish BTN is before I start trying to stack this off. Even if he's terrible a lot of his bad stack offs will be two overcards flipping. It feels a bit of a waste of a good hand if we can't stack this pre even if we expect him to call with worse.

As played with cold 4 bets being nutted at these stakes I would fold to player 4.

Preflop vs a BTN open I like the threebet for sure. My standard is to 4x 3bets OOP, however when villain is a bit shallower we can look at sizing down a little bit to ~$.85. When we get 4bet I am super sad. I honestly don't really like any of our options here without any information on villain.

I think my least favorite option here is 5bet getting it in vs the cold 4bet. Calling and folding both seem acceptable to me, given the cheap price I probably opt for the call over the fold but it's definitely going to be close. Calling will put us in some awkward spots post flop however where the board comes all undercards and villain maintains his aggression so it's definitely possible just folding could be best here.

As played the flop is obviously just a check fold then.