More advice I recently heard that I really like:
In science, it’s best practice (in fact the only true scientific practice) to only alter one variable at a time when we test something.
In life, this is far less practical. Have a problem you’re not sure how to solve? Why not try 6 different things that week and see if it helps? If it does, isolate those 6 things to figure out what works.
Solving a problem is different than discovering truth. The method should match the desired outcome.