You can also play the BETA software version of the game in League of Legends and Victory Football League. Both are well established Leagues where ownership is generally 30+.
I would also say that it's much tougher than MFN-1 as the majority of owners are very, very good players. I have some extra side rules in Legends to stop players stocking up on the fastest players, but so far have not introduced the restrictions to Victory.
https://lol.myfootballnow.com/ Currently at week 12 in season 9 - 3 teams available
https://victory.myfootballnow.com/Currently at week 9 in season 4 - again 3 teams available
My third League is the Roster Only version of the game (Franchise Football) and also runs the newest software.
https://victory.myfootballnow.com/Currently at week 1 in season 6 with 4 teams available