Keep your PS5 offline until you figure out whether those trophies have synced to PSN or not. Have they? If they are showing up online then the date is on the servers and there's nothing you can do. Even if you don't manually sync the trophies, if you booted up the game at all while online, the game would then sync trophies.
If you check your online profile and see that the trophies you want to change are not yet synced with PSN, all you can really do is erase them off your PS5 and earn them again. Be aware that doing that means you're deleting everything else associated with your profile that hasn't been backed up to the servers, including game saves and all other trophies earned on that profile on that particular PS5 (but any trophies already synced with PSN will stay associated with your profile, and you won't lose game saves in the cloud, just local ones). So you would delete your profile, then to put it back on that PS5, just log in to that profile again. Make sure the PS5 is offline before you check your trophies to see if the unsynced trophies (the ones you want to change) are gone. If they are still there you might need to initialize your PS5 but you would definitely want to back up what you can (just don't sync the trophies) before trying that, and read up on what that entails.
If you're able to delete unsynced trophies from your PS5, just earn them again with the order and timing you want. But again, once they're synced they're stuck on the server.