Trying to organize to make my working files lighter.

I just lost a quite bit of work last night. 
This program is still new to me, and I don't normally work on Photoshop either.
So I'm not sure if what I was doing was stressing my computre or not.
I couldn't find much about people talking about organizing in a project on Character Animator.

I use iMac 2019 model with 3.2 GHz 6-Core Intel Core i7, 16GB memory, 2GB Graphics.
I'm not really familier with those specs, and what each number means to working on Character Animator and Photoshop.

oh, and before I lost my data, I got warning message saying I need to upgrade graphics card.

Anyhow, my questions are:
How many puppets should I have in a scene? 
(Current project I'm working on has 4 puppets, including midground and background images as puppets)

How many scenes should I have in a project?
(Currently I only have one project, and I have total 4 scenes, 7 puppets, and about a dozen of SFX)
I was wondering if I separate projects, it would make the working files lighter.

How many layers in a .psd file for a puppet are okay to have? 
(I have a quite bit of layers in order to make my puppets do poses and short movement for cycle layers on top of lip sync, blink and all)

Is it bad that I ran out of keys to assign for triggers?

Is it bad to have too many behaviors??
(I started using breath behaviors a lot, so have smooth subtle movement in a part of background and middle ground, and each swaped characters)

I always wonder if my puppets are too complex.. In tutorial videos, I don't see all the specs on a puppet since there are folders usually closed.
Thank you for reading a long post!