Hi @Diego_Roel
Thanks for posting here and welcome to the community! 
If you reach out to n8n support before the trial ends, we can extend it. However, if the trial has already expired, the instance needs to be re-activated through a valid subscription (coming from paddle).
For the time being you could sign up for another trial with a different email address and if you drop us a message we could copy your workflows to the new account.
Let me know when you’ve email in and I will have a look 