One good option is using the built-in exchange in Atomic Wallet. It's non-custodial, and you can do this link for ETH to BTC swaps pretty quickly, usually in 5-20 minutes. No need for KYC, and it supports many pairs. I've tried it a couple times without issues, though always double-check rates. There are other services too, but this keeps everything in one app.
One good option is using the built-in exchange in Atomic Wallet. It's non-custodial, and you can do this link for ETH to BTC swaps pretty quickly, usually in 5-20 minutes. No need for KYC, and it supports many pairs. I've tried it a couple times without issues, though always double-check rates. There are other services too, but this keeps everything in one app.