In update 1.17, you can now "spawn" shulkers. Unlike other creatures, you will not need to feed shulkers and wait to breed. Instead, you will spawn a new shulker. This process can be a bit difficult, so let's see how.

First, you need to place shulkers near each other. This can be done by bringing shulkers back to your base, but you can also find shulkers close to each other in end cities.

When one shulker hits another with a bullet, there is a chance to spawn a new shulker. To do this, the shulker being hit needs to open its shell.

When hit, the shulker teleports to a new location within an 8 block radius. This happens 75 percent of the time, but is reduced if there are other shulkers nearby. With 5 shulkers around, no new shulkers will spawn. There are many videos that can take you through creating a shulker shell farm, so don't be afraid to do some research to find the design that works best for you.