A few months ago I wrote about registering multiple works at once. Doing this at least once every three months has some important benefits.
If you apply to register your copyright within three months of when you first publish a work, you are entitled to statutory damages from the date of first publication. So, even if someone infringes your work between when you publish it and when you apply for registration, you may still be able to recover statutory damages from the date of that infringement, rather than the later date when you applied for registration.
Registering a collection of your new works every three months is a cost-effective way to ensure that statutory damages are available to you.