I'm Sergei Tokmakov, California attorney (Bar #279869). I'm not Ohio-licensed but the framework is consistent. The advice above is right — three parallel tracks:
(1) Documentation and assessment by a successor contractor (gets you damages number), (2) regulatory complaints to the OH licensing board and AG (these often produce faster results than civil suits because revocation/penalties motivate settlement), (3) civil demand letter and lawsuit if needed. Likely damages are the unearned portion of the deposit plus cost-to-complete-minus-original-price differential.
Mechanic's lien is generally a subcontractor or supplier remedy, not yours as the homeowner. But you may need to file a release if subcontractors lien YOUR property for non-payment by the GC who took your money. Watch your mail.
For demand letters at this dollar amount and with abandonment facts, I draft on attorney letterhead at $575 flat. Often gets a response when text/calls don't. Informational only.