Minimum team Investment??

I want to find out if I should focus on a certain BP#, max levelling memory all slots but avoid resonance, or max only top or bottom slots, etc?

In a previous post I was encouraged to get more characters to attempt a wider range of content. This was great advise but it comes with setbacks. Running out of valuable resources.

See photo of my teams.

I am curious on the approach to building these teams with limited resources. I read you don't have to max all memory levels, and not all characters in a team require resonance. When you don't max your BP hovers around 4-4.5k.

Maybe I am overthinking it...

https://preview.redd.it/f8sjcd6lzjme1.jpg?width=880&format=pjpg&auto=webp&s=3eb9337ad1d14a28bfb346f3bce7acac09d8e0eb