I read MLS are introducing new rules next season and I think these are some good changes worth implementing:
Off-field treatment rule• If a player is suspected of injury and remains on the ground for more than 15 seconds, the referee will stop play and call for medical staff. The player will be removed from the field and remain off for at least two minutes for evaluation and treatment.
Timed substitution rule•Substituted players must leave the field within 10 seconds. If a player doesn’t leave within 10 seconds, the incoming player must wait 60 seconds before entering.
In-stadium VAR announcements•Referees will announce and explain VAR decisions.