I believe the x books work well when they are all connected at some level.
10 months of character development and following different themes with b/c story plot points that come together for a 2 month crossover over 4 titles. (8 issues in total)
This worked for me personally as I didn’t have to pick up the books I didn’t enjoy but it was always good to see the band come togeather for a big event.
Hell make it every 2 years.
This way you get reader commitment. Encourage dipping into other books if they wish and increase the potential value of back issue purchases for stores to take advantage of.
I don’t think it’s rocket science. And there is plenty of material to draw from.