Are you able to install the app on the phone using an old phone number?
If yes- just do it, then change this number asking support via in-app chat.
I do not know if manual change in here:
More> Profile> Personal data> Phone number
will change phone number connected to your account.
If you’re unable to use your previous phone number- read this:
https://www.revolut.com/pl/help/profile/my-phone-has-been-lost-or-stolen?lang=en