Senior developer mental model, 8 out of 10, inverted thinking. This mental model comes again from Charlie Munger, and it can benefit you as a developer in tremendous ways. It states that one of the most effective ways to find the solution to a problem is to inverse that problem. Don't think about how to solve it, but instead how to make that problem appear. Example, I want to get to the next level as a developer.
What should I do? What would it take for you to stay at the same level? Don't improve your skills. Deliver as little as necessary to not get fired, coast. Don't ask for more. Don't interview with other companies, and you will stay at that level. Or worse, you can even get fired. Now, invert everything I said, and you'll have the solution to your problem.