Create a folder mylocaltexmf somewhere outside the texsystem. Your documents folder is a good place.
in this folder create the subfolders bibtex\bib\mybibs
Move your bib into the mybibs folder
Go to the miktex console, settings, tab "directories" and add mylocaltexmf as a new root.
You can add more subfolders (e.g. tex\latex) and files to ...