hello new here looking for feedback on some hh to improve game

not sure on this one had no reads on villian only 9 hands should i have called or fold river?

iPoker - €0.05 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

BB: 100 BB
Hero (UTG): 155.8 BB
MP: 100 BB (VPIP: 28.00, PFR: 22.67, 3Bet Preflop: 13.79, Hands: 79)
CO: 139.8 BB (VPIP: 55.56, PFR: 55.56, 3Bet Preflop: 40.00, Hands: 9)
BTN: 70 BB (VPIP: 66.67, PFR: 11.11, 3Bet Preflop: 0.00, Hands: 9)
SB: 105.6 BB (VPIP: 18.82, PFR: 13.51, 3Bet Preflop: 2.70, Hands: 193)

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has Kc Jc
Hero raises to 2 BB, fold, fold, BTN raises to 4 BB, fold, fold, Hero calls 2 BB

Flop : (9.4 BB, 2 players) Js 5d 4c
Hero checks, BTN checks

Turn : (9.4 BB, 2 players) 8d
Hero bets 6 BB, BTN calls 6 BB

River : (21.4 BB, 2 players) 7d
Hero checks, BTN bets 24 BB, fold

BTN wins 44 BB

similar to the first hand getting stuck in this situations a lot and unsure what to do on river

iPoker - €0.05 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

BB: 42.8 BB (VPIP: 19.67, PFR: 14.75, 3Bet Preflop: 0.00, Hands: 65)
UTG: 270.2 BB (VPIP: 12.50, PFR: 7.29, 3Bet Preflop: 2.86, Hands: 99)
Hero (MP): 77.4 BB
CO: 65.8 BB (VPIP: 32.00, PFR: 4.00, 3Bet Preflop: 0.00, Hands: 25)
BTN: 132.4 BB (VPIP: 23.21, PFR: 17.86, 3Bet Preflop: 0.00, Hands: 58)
SB: 103.6 BB (VPIP: 19.83, PFR: 14.17, 3Bet Preflop: 2.00, Hands: 127)

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has Qc Kc
fold, Hero raises to 4 BB, fold, BTN calls 4 BB, fold, BB calls 3 BB

Flop : (12.4 BB, 3 players) 5h Kd 7c
BB checks, Hero bets 2 BB, BTN raises to 9.2 BB, fold, Hero calls 7.2 BB

Turn : (30.8 BB, 2 players) 2d
Hero checks, BTN bets 17 BB, Hero calls 17 BB

River : (64.8 BB, 2 players) 8d
Hero checks, BTN bets 48 BB, fold

BTN wins 108.6 BB