If you mean the nip05 address (nostrplebs.com for you atm) then yes! Changing to a custom / self hosted or another address provider?
Discussion
Self hosted. I tried to change it but it doesn’t work.
Just to make sure, you put your name+npub in the /.well-known/nostr.json file on the webserver?
Might also have to change it by editing your profile on your client to match the new address.
There could also be a small delay while the info propagates through the relays so can wait a bit and see.
https://torontoplebs.ca/.well-known/nostr.json returns data also for your account.
There should be no problem to update your profile to farfallica@torontoplebs.ca and you and others should see it as NIP-05 verified. Make sure when editing your profile to enter the new nip05 identifier in the field that is named for that purpose. I only see a profile change from your account where you posted the nostrplebs identifier. 🤷♂️