How can I get small amounts of ETH for gas fees?

Hi, I’m new to crypto and I think I made a big mistake.

I had polygon USDT sitting in my wallet and I thought I should stake it. So I staked it as sideshift tokens (svXAI/XAI) on the ETH network, and it automatically subtracted the gas fees from the amount that I deposited. However now I need to unstake them, and it seems like I need some ETH for the gas fees.

I don’t even know how much gas it would need, but I think it would be around $2-$3. I don’t have any leftover crypto I could swap for ETH except like 20 cents of polygon that I used to pay gas on the polygon network.

I really cannot buy ETH to pay these small fees. I talked with sideshift support and they said they cannot subtract the amount from my tokens. Do I have any options?
Please I’m really at a loss here.