I sat this guy at 5-10 anonymous table obv a reg.  We played 100 hands and this hand came up.  He folded to prob 70% of my 3bets and I was 3betting about 15%.  Nobody is really stuck.  I 3barrelled him prob 4 times in srp and he snap folded.  I was just going for 3 streets because this guy didn't like to fold to me.  So when he mn raises me on turn my gut instinct was he was doing this as some sort of blocker bet.  My standard here is to just flat and check river but decided to donk river with intention of not folding.  I know this line is very exploitable but we are both anonymous.  I feel like I didn't  get max value and that I should of clicked back turn and shoved river or just donk jammed river.  Thoughts?