your bet sizing on early streets is causing you problems

hand 1 - bet turn a little harder. Fold to the turn raise or jam over. With state reads, I prefer jamming.

hand 2 - that many players you can bet the flop> turn is fine, river bet bigger. You gotta call here cos he has a random 8 or trips more often than a better boat

hand 3 - raise flop bigger, like 5x or even 6x, too many players, board is too drawy, someone is coming along for the ride. You should be happy to get it in on the flop if at all possible. Turn is fine as played. River is gross.

hand 4 - river is a call. There could be an argument for jamming, but i don't buy into it.