The deal is done. Congratulations. You have your money or a large portion of it. The rest of the money is reasonably well secured.
What next? You may have post-closing contractual requirements such as transition training or even employment for a period of time. You most certainly will have the obligation to “not compete” with the buyer.
If you have post-closing payments, you will have to be diligent about your collections. Late payment habits tend not to cure themselves.
The deal is not really done until your indemnifications, representations and warranty obligations terms have expired, your non-compete obligations have expired and you have been paid in full. Then it really is over.