It all comes down to focusing on the controllables.
wasting emotional energy, and time on something you have zero control over only costs you.
This bit of advice is wasted on a number of folks.
I lose very few clients during the year (except for death). At one time I would contact them to find out if it was an intentional cancellation, oversight, or trickery. Almost without exception it was a waste of my time so I simply stopped contacting them.
If someone leaves, they have their reasons, and if they fail to contact me before making the change (and some do) there is usually nothing I can do or say to bring them back.
Renewals are like gold but when you get to the point that new clients are easy to attract, there is no reason in losing sleep over something beyond your control.