I think everyone asks this question at some point or another. It might be right after a crash, or just due to boredom.
What made you get into the saltwater hobby in the first place? I think this should answer why you have spent so much time, energy, and money on your tank.
For me, it was the fascination with how much life is contained in every square inch of live rock. I like the little things in a reef. The interaction between animals such as clownfish/anemones, shrimp/gobies, etc. And the diversity of corals.
I have dropped out of keeping fish on and off over the 20+ years I have kept fish (fresh, salt, ponds). But there also seems to be a call again to return to the hobby.
Maybe you feel like you are no longer challenged with the tank. In that case, I say pull up a chair and just watch and enjoy the fruits of your hard work