Ah, gotcha! I know CakeWallet integrated a few swapping services for going from Bitcoin to Monero etc.

Maybe try starting with ChangeNow.io

But they don’t go straight to L2. You’d need to send from Bitcoin to Lightning via Boltz.exchange or similar. Maybe slightly cheaper to use the funds to open a channel on Phoenix or Zeus, and play around with self-custodial Lightning if you haven’t before. You can still receive zaps to Alby (I do, currently) and send zaps from Zeus etc.