My stomach is so big

I’m skinny everywhere on my body except my stomach is massive. I’ve had 2 kids and it’s not really even lose skin but just fat. I have celiacs disease and have already cut out gluten and noticed an improvement but I’m so tired of looking pregnant all the time. I’ve been dieting and exercising for 6 months with no improvement with my stomach. Idk what else to do. I’m not in the financial state to be getting a tummy tuck.