a watch-only wallet is just that. you can't spend from it because it doesn't have the seed or any private keys. that's why when you open a watch-only wallet you get a warning telling you to make sure that you have the seed or private keys recording somewhere.
without the seed or private keys there is nothing that can be done.
But in transaction history I see that I used to deposit and withdraw from that watch-only address. How that was happened do you have any idea?