It can be disheartening when your following goes down by one or two (or more). But it’s not always a bad thing when you lose a follower or subscriber.
It means your following is becoming more attuned to your posts. It also means your content was not for the people who unfollowed.
When I lose a follower or subscriber, I tell myself that it’s a good thing because they were probably never meant to be following me in the first place. I also tell myself that my audience is becoming more refined.
It’s way too easy to get caught up in numbers and analytics in a world based on stats and performance. But what I would suggest is focusing on the quality of your content and engaging with your audience as opposed to obsessively tracking every number surrounding your account.