How do you deal with losing interest in a campaign?

Hello GMs of Lemmy!

I have been a GM myself for about 7 years or so, with more or less the same players in most of my games. What I have started to run into in the recent year or so, is that I have started to lose the interest in campaigns if the sessions get canceled often.

So my question is that how do most of you deal with this issue where you might start to lose interest in a campaign in the middle of it?