NL50 97s

Poker Stars $50.00 No Limit Hold'em - 5 players
DeucesCracked Poker Videos Hand History Converter

BTN: $53.11 - VPIP: 21, PFR: 17, 3B: 9, AF: 2.8, Hands: 156161
SB: $50.00 - VPIP: 20, PFR: 15, 3B: 5, AF: 2.0, Hands: 18297
BB: $50.00 - VPIP: 40, PFR: 31, 3B: 21, AF: 3.3, Hands: 85
UTG: $50.00 - VPIP: 22, PFR: 18, 3B: 6, AF: 2.8, Hands: 167240
Hero (CO): $70.90
Pre Flop: ($0.75) Hero is CO with 9 7
1 fold, Hero raises to $1, BTN raises to $3, 2 folds, Hero raises to $7, BTN calls $4

Flop: ($14.75) 9 6 2 (2 players)
Hero checks, BTN checks

Turn: ($14.75) 4 (2 players)
Hero checks, BTN bets $7.04, Hero calls $7.04

River: ($28.83) 8 (2 players)
Hero checks, BTN checks

I payed bad preflop. As played preflop, how to play postflop?