You can get bot lobbies in squad busters, if you have reached squad league it will NOT get keys towards league leader board.
Have a second phone with the game installed and play the tutorial up until you can add a friend.
Once you can add a friend on the second phone, add your main account and invite to party.
On your main phone accept the invite and start the game with the second phone.
You will get put into bot lobbies for the most part and maybe 1 or 2 real players here and there but they tend to be trash.
Do not upgrade anything after the invite friend appears on the alt account as it could out you against harder opponents