Agree with benny that you need to look a board texture compared with villains range, this is not a wet board.
You say he is unknown but this board is great for your hand vs both fish and regs.
A loose fish will have all sorts of crap in his range that you can just bet big on all 3 streets for max value.
A reg will usually have mid pairs, some broadways and maybe some suited connectors.
The turn is a great card for you vs regs because it will hit some of their floating range, eg AQ/KQ and some regs will be stubborn with their mid pp’s here too because they think you may bluff the over card. You get value from a flush draw too but if you look at the combinations of flush draws in his range they will be a very small part.
The river is perfect to bet again as the only hands that improve are the stubborn 88 and the odd runner runner, again a tiny part of his range. The rest of the hands that called the turn may well call again on the river but will mostly check back if you check. (I know that didn’t happen here because they bet river when you checked but most of the time they will check).

As played call.