Multimodularity of the VK bot in python with the vk_api library. How to implement it correctly?

Question

Python

I remembered the old bot, at the moment there is a garbage dump with 1.2 k lines in one script. I would like to rewrite everything. Each command is executed in a new thread, which slows down the bot. Maybe asynchrony is needed here?
Plus, I want to break each part of the commands into modules, rp, kick-ban, and so on.
How to do it right? In each module, make a handler and process the long pool in a loop?
Or do it in the main script? But there are quite a lot of commands, which will slow down their processing.