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What are sin bins? Football could trial rugby-style penalty in Premier League next season
(www.telegraph.co.uk)
This community is being retired in favor of !football@soccer.forum.
Start with "only captain can talk to ref" and give out yellows for every one still crowding the ref. If this doesn't work try timed approaches, even if I prefer the "every coach can call VAR 2 times a half time" rule, even if it is tactically misused when games are ending.
I would also add if you fake an injury you have to leave to field until the next pause allows you to get in again.