Hello,
A scruffy looking nerf herder guy once said "never tells me the odds", but you should have a good chance to recover the account.
If you remember what is the email address, even if you don't have access to it anymore, the support should be able to help you.
if you still have access to your collector edition, would you happen to still have the cd box and the leaflet with the code in it? a friend had a similar issue with his account and it helped him regaining access to it.
But you will need to contact the Swtor support.
https://help.ea.com/fr/customer-care/swtor-suppor
If you made purchase on your Swtor account ( cartel coins, subscription), you might be able to log into the EA account linked to it to check your purchase history. Swtor account created before 2019 have an EA account linked.
If you log via the EA website( https://www.ea.com/ea-app) If you have not made any change they will have the same email address, so even if you can't log into your Swtor account, maybe you still have access to your EA account?
I would also keep the security key handy as the serial number on the back might also prove handy to have.
Hope you will get your account back :)