Add recovery phone number instead of email
...since the only one email is in use and can not to add any other recover email.
Otherwise users have to register another email on different or in your service and making email names busy but unused (used for recovery purpose only).
And somewhere in future after some period 3-6 months recovery email can be deleted and user can not to recover main email address password. So users have to remember sign in into that recovery email on constant basis. But if there will be 1-2 months delay to sign in into recovery email user can forget his password from recovery email...
Please, let users to add recovery phone number to password recovery.
While discussion that idea if to send SMS is too high you can add recovery counter for example no more then 3 times during month
or
to add money account to email account to make users be able to add money to recover password by phone.
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ag commented
So phone number is already in Settings.
But you should send verification SMS after phone number is added! -
Nikolay commented
or
Add recovery phone number along with email