It's great when I want some to go fishing - just head out at night with a flashlight. But not so great to have such a bumpy lawn.
I'm also tempted to start over - the bumps, my lawns old, so it doesn't all look like the same kind of grass anymore, but there are sections that look different than others. And my sprinklers are a mess that I've thought needed to be torn out and start over for a while. But that sounds like a ton of work and I'm way too lazy.
So sometimes I think about just watering the heck out of it and renting a lawn roller to see if I can flatten it some, then aerate to hopefully keep the worm mounds from returning.