Yeah, that's actually a really terrible spot to be in. This is never a bluff, and your full house is crushed by his entire value range. 1010, 99, and 109 play exactly the same way deep-stacked. And when he raises you on the river as opposed to the turn, it's very likely he was slowplaying a boat. If you were semi-
bluffing with a draw, he doesn't want to get you off your hand. He actually wants you to hit, or give you more rope to hang yourself.
Being able to make disciplined folds will help your winrate a ton. Back then, especially if I was on some tilt or downswing, I'd call a third barrel thinking "Seriously? They can't have it again." And everytime they'd show me the best hand. Being able to make hero folds, especially OTR or in 3-bet pots are going to save you a ton of money. I actually folded a straight once (56s) on a 789Q board after I got raised on the turn and bombed all-in when the river came a 5, making it 789Q5. Couldn't put him on anything other than J10. Don't think he's turning sets or two pairs into bluffs, and think almost nobody opens 40%+ in the SB. Plus, I'm blocking the fives and sixes in my hand, and another 5 was on the board. Also folded AK once when I flopped a K in a 4-bet pot right on the flop with a 180bb deep stacker. Just had a gut feeling he had Aces or the unlikely KK, and I was right (Aces).
To beat 25NL, it's just value bet more, bluff less, and learn how to fold postflop/preflop against aggression. They are not playing back at your as much as you think they are. 4-bets/5-bet shoves are 85+% Aces or Kings, so don't start committing yourself everytime you have AK just because you have OMGZ BLOCKERZ or because "if I don't 4-bet/5-bet AK my range is going to be so unbalanced." You will go broke.
And I think it's neat that you're taking shots with 10BI for 25NL, but I would recommend against it. Variance is a bitch, and it's not super likely you can keep pushing forward with that bankroll. I've been a 25NL reg on Bovada for about 3 months, winning at a rate of 8bb+/100 hands for a decent sample size. I've gone on about 2 6BI downswings, and my biggest downswing was 14BI. I recently got out of that 14BI downswing and swung up 20BI; one hell of a roller coaster. Also, it will probably feel like every decision you make with a limited bankroll more stressful and tilting if you make a mistake or get sucked out on big time. You will also run very cold at times and get sucked out on or cold-decked frequently for a good stretch of hands at times, so your bankroll needs to be able to withstand that.
Wishing you luck and great job so far!