Congratulations, it sounds like you made measurable progress toward your goal. I think the best you can do is embrace the fact that: 1. It's always changing 2

Congratulations, it sounds like you made measurable progress toward your goal. I think the best you can do is embrace the fact that: 1. It's always changing 2. Feel confident in that something that you learn will become relevant again 3. You can't know everything In addition, find a team that will help you learn and practice everything you are interested in. Look for a company/team where individual engineers have to wear many hats.