I new in node develop , i made an integration with firebase for communities implementing cache :) What do you think?

Hello, I have a question, how can I avoid nested promises on node?This is my code:https://pastebin.com/xvAQFmDX?fbclid=IwAR3fm4Dkv_A8vG7toIOYNxvMlla304u4bwA0LhXBRSprJjiTGOmoqqz2qgUFor example, to make a request for firebase it looks like this:

Submitted July 18, 2020 at 07:59PM by JuniorMathDev