Sometimes its best to just step away from a problem. Throwing more brain and time toward the issue is the brute force attempt.
Let it simmer and stew a bit in your head. It isn’t guaranteed that you’ll come up with the answer, but it’s likely that it’ll keep your stress levels down.
The answer to the problem can even sometimes present itself while you are working on something else entirely.
So, relax, it’ll come to you.