Too passive?

[acehole60]

I maybe too passive in spots like this. Should I get another big bet in here or is it ok to just call down?
Villain is unknown. Sorry I don't have a converter for Crypto.

HERO: posts small blind $1
EHA1: posts big blind $2
----- HOLE CARDS -----
dealt to HERO [Ah Qd]
Tinch: folds
GurMan: folds
osirisdd: folds
HERO: raises $3
EHA1: calls $2
----- FLOP ----- [3s Qs 5c]
HERO: bets $2
EHA1: calls $2
----- TURN ----- [3s Qs 5c][6h]
HERO: bets $4
EHA1: raises $8
HERO: calls $4
----- RIVER ----- [3s Qs 5c 6h][8c]
HERO: checks
EHA1: bets $4
HERO: calls $4

[jt1]

This is a blind battle so EHA1 could have top pair, a 6 or a 4. 3betting tptk on the turn is standard in a blind battle.