You cannot recover your Gmail password without phone number and recovery mail.
You can recover mail from your phone number with the verification process or you can get a verification mail on your recovery mail, then you can change your password.
The process is not so hard. Tap ‘forget the password’ when you tap sign in.
Now pick your option. Google will send you a verification code on your phone number. Type it and change the password.
On recovery mail, google will send you a mail. Tap on the link in mail and change the password. Type your new password twice to confirm it. Your password has been reset.