Easy bet. They will call with QJ/KQ/JJ/KT at least. Because they didn't raise flop, TT/99/KJ are a bit less likely. Typically good 1 pair is bet for a larger sizing because of its vulnerability. Wouldn't want to give cheap rivers with this kind of hand. A bet somewhere close to the size of the pot seems good.
I'd bet a bunch of rivers too, trying to get called by QJ/KQ. Bricks, ace, queen are good ones
. After they fail to raise flop or turn, I'm not expecting surprises on the river too often. Bet/calling is an option against aggro players. A line I often take is to bet like 30% pot, they raise to pot, or 1.5x pot, and I just pick off the bluff. Some people just don't have strong hands after calling twice, so it doesn't make sense to bet huge. Although here I think QJ/KQ are such strong bluffcatching candidates, and so prevalent in their range, that a larger river bet is good.