6 handed, part of a mix, 1/8th antes

3rd: K bi, J folds, I complete (24)9, 6 2bet, K folds, K folds, bi folds, I call
4th: 62 bets, I call (24)98 (just fold here?)
5th: 62T bets, I call (24)988
6th: I bet (24)9883, 62TA calls
7th: hero with (24)9883(A)

Result:

Razz isn't a 2-7 hand game...

https://en.wikipedia.org/wiki/Razz_(poker)

2-7 razz is a popular game variant that’s been played for going on 2 decades now. You’ll find it in many high stakes mixes.

Fourth seems like a call given there was a raise on Third.

I don't think villian is calling on Seventh with a Ten given your line, especially once you led on Sixth which indicates you've got a made Nine.

Can't in a million years fold a 9-draw on 4th in a double bet pot!! Can't fold in a single-bet pot, either...

your play on 4th and 5th is based on your reads of that player. does he start off with only 3 perfect or is he capable of making a play versus your 9 door? if he has 3 perfect, then the equities are around hero 25% and villain 75% on 5th. if he's paired or has paint in the hole, it's around hero 60% and villain 40%. If sometimes he will make the play you can estimate yourself an equity somewhere in that range.

if he doesn't make moves i'm just mucking on 4th because the boards are going to get too dicey for you to continue, even if he has paint in the hole.

I'm assuming he checked to you on 6th? unless he's very tricky that highly indicates pairing the ace.

at this point after being called on 6th, i would assume he drawing smooth and would check back. His board gets first option no?

Assuming I didn’t miss type the hand yes I was checked to 6th and 7th. But FYI this is 2-7 razz, aces are high

Villain does have to call some Ts here given we could've paired our 3 quite easily and then bricked, especially if he never checks when he improves then he probably has to c/c quite a number of Ts to not be exploited. That doesn't mean he necessarily will though.

If he ever check/raises in these spots then betting basically 100% of our river range isn't great, so we should probably check back this and bet all 8s so he doesn't get the go-ahead to always check in his spot.

Grunching without looking at the spoiler, I'll save that for the end.

Because you don't have a premium door card, I would expect villain to have at least some uncool cards in the hole when he raises your open. He continued with a Ten so likely no worse than a Nine in the hole. You're blocking Eights, so unless he has precisely a Seven in the hole, his smoother draws will be weakened by straight draws thanks to the Six in his hand. He likely has very few cards to draw out on you, so betting the river is not as thin as it seems.

In this spot I revert to notes, whether the player is showdown bound or can get off made hands. If he will always call with a Ten then bet because he'll have more Tens than anything else. Against some players I can bet/fold, not a line I like vs trickier players.