I have some USDT and USDC in my portfolio that I'd want to stake in a "De-Fi" dApp without worrying about it in a long time. There are liquidity pools in Uniswap with attractive stake rates, but there's also Compound.Finance with its lending services. Both of these platforms are built on the ETH blockchain, so gas fees would be astronomically high. I've read about some platforms being compatible with Polygon (MATIC), but I'd have yet to see if it's worth the shot (especially in terms of security/reliability).
Do you know the safest way to stake stablecoins without breaking the bank? Also, do you think it's worth it? Or should I consider other options? Any suggestions and/or recommendations would be greatly appreciated. Thanks in advance.

Stablecoins are not guaranteed at the moment, because stablecoins are based on the rise and fall of the $ itself.
My advice is don't put all your finances in stablecoins, it's better 50:50 you can try holding other coins like ETH, XRP or whatever potentially