How to open custom google maps?

Question

Google Maps

Good afternoon!
I'm making a custom google map with points of interest in our area of ​​residence. It is open to everyone to read.
Faced such problems:
- for some users, when opening a link (android), the map simply opens in the browser (chrome). Google Maps is installed on the phone. Maybe there is a way to forcibly specify through which application to open? Any intent links?
- After the user has used the map through the google maps application, after a while the map disappears from it. Can I somehow save it in the application so that there is always quick access?
- Is it possible to somehow increase the number of layers more than 10?
Thank you!