Do you play in a league? Don’t have to be into competitive play to enjoy sociallising with other pinheads on a monthly basis. If that’s not your thing try playing on location to see if it’s really just your games that aren’t exciting or if you have just lost interest for now.

I wouldn’t rush to change up your home lineup as others have suggested. The new and shinny high doesn’t last long and the you will be back at square one. If there are games down in your collection get them fixed even if it means having to call in a tech. There’s no bigger buzz kill then broken games taking up space.

If you do decide that you need a change up my advice looking at your collection would be.
Keep the medieval/mettalica/whirlwind/earthshaker sell the rest and add two early solid states either Bally or Stern Flash Gordan/meteor/8 ball delux/Stars etc.. Dropping a couple of games is not going to hurt and you will feel better for being able to let some go. Adding a couple of early solid states is the best for home environments. Short quick intense play is often all you want after a day at work.