Good candidate for a modest 1 year deal.

Smith is the classic "prove it" guy.
Playing alongside Donald is nearly a done deal to give Smith stellar stats if he can stay healthy.
And if he stays healthy and motivated, the Rams get a really good, stout edge rushers.

Offer him a 1 year "prove it" contract and he just might want to do it in hopes of a longer term, bigger payout in 2023.