UTG: $26.50 (53 bb)
MP: $50.00 (100 bb)
CO: $55.43 (111 bb)
BU: $55.75 (112 bb)
SB (Hero): $50.50 (101 bb)
BB: $136.57 (273 bb)

Pre-Flop: ($0.75) Hero is SB with 8♣ 9♣
3 players fold, BTN raises to $1.11, Hero 3-bets to $4, 1 fold, BTN calls $2.89

Hello BU looks like reg 23/18/7 fold to 3b 80% but only 20hands so it could be just bad run of cards

Flop: ($8.50) 6♠ 2♠ T♦ (2 players)
Hero bets $5, BTN calls $5

Turn: ($18.50) 4♦ (2 players)
Hero bets $11.42, BTN calls $11.42

River: ($41.34) J♠ (2 players)

On the blank our hand is good candidate to shove because we dont block any draw but what about this river? The problem is the only 1spade hand which is blocking flush that i have in my range after betting flop+turn is ATo which i might 3bet in this positions but its not enought combos of bluffs and it still has relatively solid sd value. If we are shoving only ATo with spade we are underbluffing this spot and having Ts is anyway not that good off a blocker and i have around 20combos of flushes on this river. What should our river bluff range looks like on this river do we just giveup our hand because of no blockers and underbluffing this spot? Villian still has alot of 1pair hands that we can make fold by betting river. If we bet do we still go allin considering we have only few bluffs on this river? (we have around 30$behind)

My 3bet range in this position looks like this