Google Play Account Recovery Failed Due to Inaccessible Phone Number

For about one month I have been unable to access my Google Play account. When I try to sign in, I receive the “Couldn't sign you in” error on the login screen. The account I am trying to recover is linked to the email address tm0866***@gmail.com, but the phone number that was registered to this account is no longer available to me, so I cannot complete the verification process. During this period I tried to recover the account but I could not get any result and I am still locked out. I have important data and purchases linked to this Google Play account and I do not want to lose access to it. I kindly request that my Google Play account be recovered and that you help me log in again by updating or removing the old phone number, or by providing another verification method.