Also, weather is always bad at the end of the season. Keep it short and sweet until public interest demands more games. Make it inescapable. Right now it is virtually invisible. This would encourage teams to play a higher level of soccer.
Fear is a great motivator.
Improve color commentary on televised games. No playoffs, just a regular season points champ and a league cup title Build soccer specific venues for all teams. Require natural grass fields of regulation size. Offer incentives to players for good performance and improvement Continue developing American talent. Promote them obsessively.