PokerStars - $1.32+$0.18|150/300 Ante 25 NL - Holdem - 4 players
Hand converted by PokerTracker 4
CO: 2,677 (VPIP: 17.95, PFR: 11.89, 3Bet Preflop: 10.34, Hands: 203)
BTN: 5,800
SB: 1,971
Hero (BB): 3,052
4 players post ante of 25, SB posts SB 150, Hero posts BB 300
Pre Flop: (pot: 550) Hero has J♦ 3♠
CO calls 300, fold, fold, Hero checks
Flop: (850, 2 players) 6♦ 7♥ J♥
Hero ?
What is the best plan of action here?

