More importantly, you are not your code.

This is actually harder for more senior/managerial folks, as often they'll build/buy/create something that's big for their level and now they're committed to this particular approach, which can end up being a real problem, particularly in smaller orgs.

Once upon a time, I worked for a lead who got really frustrated with our codebase and decided to re-write it (over the weekends). This person shipped a POC pretty quickly, and got management buy-in but then it turned out that it would take a lot more work to make it work with everything else.

We persevered, and moved over the code (while still hitting the product requirements) over a two year period. As we were finishing the last part, it became apparent that the problem that we now needed to solve was a different one, and all that work turned out to be pointless.