As I know, you can't Install Play market and from Play market.
If you need to install prorgrams/apps, You have to find the APK's (Installer file on Android) outside Play.
Like these.
https://apkpure.com/
https://www.apkmirror.com/
Or ask Miss Google to find "name.apk" for you.
Have fun guy's.
BUT remember installing outside Play is on your own risc.
And you have to turn off, install from less secure site and turn on when you are finish installing.
"One very importen thing to remember" You are NOT loaded with space in your MAXI...
It can happen, that you need the space for your "updates"