Deepstacks 5plo oop

Coinpoker - 5plo 7 handed

Preflop 3bet ok? or it's a call or fold?
Flop we never folding right?
And we just check it down on turn/rivers?
If we were to face a big bet on the river, it's a fold? If villain bets small, we just calling or jamming or folding?

Hero (SB): 231.6 BB
BB: 174.4 BB (VPIP: 82.35, PFR: 30.88, 3Bet Preflop: 11.54, Hands: 72)
UTG: 98 BB (VPIP: 42.86, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 7)
UTG+1: 233.4 BB (VPIP: 46.15, PFR: 15.38, 3Bet Preflop: 0.00, Hands: 26)
MP: 100 BB (VPIP: 28.70, PFR: 20.37, 3Bet Preflop: 13.04, Hands: 108)
CO: 168 BB (VPIP: 73.27, PFR: 15.84, 3Bet Preflop: 8.77, Hands: 101)
BTN: 316 BB (VPIP: 55.56, PFR: 19.44, 3Bet Preflop: 16.00, Hands: 72)

Hero posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has 7♠ 4♥ 8♠ 6♥

fold, fold, MP raises to 3.4 BB, CO calls 3.4 BB, BTN calls 3.4 BB, Hero raises to 18 BB, fold, fold, fold, BTN calls 14.6 BB

Flop: (43.8 BB, 2 players) 6♦ 7♦ T♥
Hero checks, BTN bets 30.2 BB, Hero calls 30.2 BB

Turn: (104.2 BB, 2 players) A♣
Hero checks, BTN checks

River: (104.2 BB, 2 players) 4♠
Hero checks