[chipuni]

The single best thing I ever did to level up my knowledge:

I left a (huge) company that I had been working with for seven years, to work for a tiny company. It taught me just how little I really knew.

If you want to level up as an engineer, once your current company runs out of things for you to learn, change companies to the exact opposite. Shift from a large company to a startup. Shift from education-based to finance-based. Shift everything that you can, so that you get completely different problems.