Anything below 30 gwei is good to me, though sometimes despite gas fee being less, you still pay good amounts as some smart contract interactions are just expensive.
For example, just a few days, I was claiming EIGEN tokens, gas fee was around 20 IIRC, and it showed 13 USD as estimated transaction fee, I postponed it and claimed it few days later when gas fee was below 10 gwei and paid about 6 USD.
Ether transfers cost the least, token transfers bit more, and smart contract interactions, the most.