Returning player, unable to subscribe.
Your swtor account has been disabled for purchasing, this is due to the linked EA account has had its data wiped due to long term inactivity
The linked EA account was created at the same time as the swtor account was created , and will likely use the email address used on account creation ( this is most likely the case unless you have changed the email on the linked EA account previously)
If you have access to the email address used to "create" the swtor account , then use this link to reset the password on the linked EA account and then login on that account to get it restored.
Let me know if you think you have sorted the account and i can recheck the account
if you have no clue and cant get this sorted then you will need to call swtor support when the lines are open and they can update the details on the account for you
https://answers.ea.com/t5/General-Discussion-Technical/INFO-Getting-Help-and-Board-Guidlines/td-p/48...
So if the original email is non existent you will need to call swtor support to update the email used on that account
