If you enjoy leveling alts, maybe you shouldn’t stop 
? It’s a relaxing, low- effort thing to take a breather from your main character without leaving Azeroth. During Legion I decided to have at least one character of each class, to get all the class mounts. Then the Allied Races came, with their shiny new armors, so obviously I had to level up a bunch of characters more…
“Alting” is a great passtime that can be relished.