Get rid of offsides. It slows the game down and is hard for most observers to understand. It’s also stupid.

Punish fake injuries and possibly get rid of personal fouls. Have a penalty box like hockey. Maybe only allow players to kick each other.

Make legitimate close shots on the goal result in a corner kick instead of turning the ball over to the goalie. This way players are rewarded for taking risky shots. And a missed shot doesn’t result in the game’s momentum halting to a stop. It’ll result in more goals and make plays happen more often.