Well you seek contempt and such sanctions/costs as the court will entertain.
The problem is if its not a financial impossibility for him to perform the court may not hold him to an impossible task--now a difficult task is a different story--that they can hold his feet to a fire..
Have you made repeated demands on paper that he perform?
Has this impacted you/damaged you--can your prove it. (In theory you are still on the hook to pay--but that's hard to articulate as damages if the loan is not in default. )
How do you know/prove he failed to even make a try at it?
Lets assume its improbable for him to perform--what remedy do you think should be delivered to you.
Are you still on the deed?