Check/fold the flop. The flop bet can't possibly be good with 2 over cards on that drawy flop (with hero holding the low end of a gutshot draw) in a 4 way pot.
As played, check/fold the turn. The flop was check/raised and a 3rd player cold called the bet and the raise. I wouldn't expect this bet to get folds nearly enough to be profitable.
To answer your question, you possibly have as many as 10 outs against a better hand. However, they might not really be outs.
- Someone could possibly already have a straight.
- An 8 makes you three 8's, but also means that anyone who has just a 6 or just a T has a straight.
- A T makes you a straight 7 - J, but Q8 or KQ would have a higher straight.
- A T or 6 of clubs or diamonds could make someone else a flush. I think someone would be more likely to have a club flush than a diamond flush, so I think a club coming is worse for you than a diamond, but both could make someone a flush.
I think the best river card for you would the 6h or 6s (6d would be pretty good too). I would be pretty confident with your hand if any of those were the river. But any of the other cards that improve you to a better hand have a good chance of improving someone else to an even better hand.
And if an 8, T or 6 does improve you to the best hand, it'll be hard to extract money from the other players because the board will be so dangerous. There will be 4 to a straight on the board. Of course, as you played it, that would matter because you're already all-in on the turn, so there will be no river play.
Check fold the flop, I don't like the donk and hate the call. Check fold the turn as it's multiway and both players could have hands they are not going to fold and a lot of your outs might not be outs.
In general it's a pretty aggressive style, is that optimal for nl2?