Ideally, people would have actual amounts or HHs but this happened in the 7 pm (PST) $40 PO freeroll on Carbon earlier today and Im too lazy to pull up the actual numbers when I just want to illustrate my point.

Blinds: 50/100

My stack: slightly over 4k

I raise 3x UTG with KK
Folds around to BTN who calls - approx 3k behind

Flop: 3s - 4d - Jc
I cbet 300
Villain raises to 600

How would you proceed?