You have two options:
1. You can keep both accounts
2. You can close the one you had before and move the funds to current work-related HSA
You should not opt out of the current work-related HSA account because you need it to receive employer HSA contributions.
What if you want to keep the old HSA account? You should opt to do a trustee-to-trustee transfer once or twice a year by moving funds out of current work-related HSA account to your old HSA account, just be careful of fees associated with the move.