Correct me if I'm wrong.
I read ActivityPub standards and dug a little into lemmy sources to understand how federation works. And I'm a bit disappointed. Every server just has a cache and the ability to fetch something from another known server. So if you start your own instance, there is no profit for the whole network until you have a significant piece of auditory (e.g. private instances or servers with no users).
Are there any "balancers" to utilize these empty instances?
Should we promote (or create in the first place) a way how to passively help lemmy with such fast growth?
Yep and you're not subject to the whims of your home instance admins deciding what they will and won't federate with, and how you must behave across the fediverse.