Request for termination of the contract by the client

[termen]

Hello, Upwork Community!

After the conclusion of a fixed contract (the entire amount in Escrow) I was given only a part of the access to work. I requested the necessary access, the client promised to provide them.
After a while, the client closed all accesses, offered to end the contract, and offered compensation (the reasons are not clear).

In fact, I did not complete the task, although I managed to consult the client, performed an audit, drew up a work plan, and Request for termination of the contract by the client
performed a backup.

What compensation can I ask the client in this case?
How will the termination of the contract affect my JSS?