@DaffodilFine, regarding your first hand, I’m not a huge fan of how it was played.
Let’s start preflop. Nearly 200 blinds deep, I would’ve liked to see a roughly pot-sized (~25 chips) 3-bet, with a fold to a substantial (75+ chip) 4-bet. A3 offsuit doesn’t play too well postflop, particularly 6 ways. What I mean by that is that if an ace falls, you’re behind almost any other player with an ace; it’s rare you’ll have a flush draw (three-heart flops are very rare, and when they do fall, you may have to worry about straight flush draws which would invalidate your ace-high flush draw); and if you do flop a straight draw, it will likely be a gutshot with just four outs, and/or a draw to the low end of a straight where you’ll have to worry about a higher straight. With a 3-bet of that size, you’ll knock out a bunch of weak hands that might randomly connect with a flop, and make it easier to bluff on future streets. It might also win you the pot preflop - and picking up 10BB isn’t a bad thing at all!
On the flop with a 24-chip pot, facing a min-bet from the small blind, you should be raising. You have a very strong draw to the nut flush, but could also already have the nut flush, or a set. I’d advocate a size close to the size of the pot, placing other flush draws and top/overpairs in a tough spot. Again, it’s not a bad thing if the rest of the field folds to you and you scoop 12ish big blinds. If one or two players call, it’ll make it easier to bluff on later streets if your flush doesn’t come in, since you’ll only need to knock one or two players off their hands instead of five. If your flush does come in, then you’ll have a hefty pot to add to your stack.
Once the offsuit, low turn bricks off, and Richard puts you all-in, you should have folded. Calling 380 chips (190 big blinds!) in order to win an additional 375 chips after rake is taken out would have required you to have >50% equity to be profitable in the long term. With bottom pair and top flush draw, you only have 16% equity against his exact hand. Just about any hand in his value range - any made flush, top pair with an ace kicker, overpairs, sets - have far more equity than your hand. Also, some of his made flushes could invalidate your flush draw. If he held 8h9h, a 7 or Jack of hearts on the river would have made your flush, but his straight flush would have won. Similarly, Jh9h and Jh7h would have removed 8h from your outs, &c. Pretty much your best hope is that other players would call the all-in in order to boost the number of chips you stand to win, but facing a SB jam and a BB call, the only hand I would have even considered calling in a later position would be a pair of pocket tens, hoping to pair the board.
You got lucky this time around. It’s better to be lucky than good, as the saying goes. That said, similar to the discussion we had on another thread, I think there’s still some room for you to improve your play and long-term win rate through targeted aggression.