Question:Sue tenant for unpaid balance

[Tianyi Chen]

I had a tenant who requested an early termination of the lease last year.  I agreed since she was owing me two months rent.  I asked her to sign an agreement of early termination and paid all the remaining balance minus deposit by 3/31/2020 or I will reach out to collection company.  Now 3/31/2020 is approaching but the tenant has not paid anything yet.  The total due is about $3,000 including repairs, rent and unpaid bills.  I don't have the tenant's current address.  Is there a way to sue the tenant?  Is it worth the effort to do so?  My rental property is in Newark, DE.

I need some suggestions.  Thanks.