Makes shove a standard action. Shove should be a standard action because
- It's an assault. Most assaults should be standard actions. Bonus action assaults should be rare. Most bonus actions should be personal.
- Bonus actions should mostly be class features. Improvised bonus actions should be rare. Potions, dipping, jumping, 1d4 with your offhand dagger. Dealing 30 damage by pushing your enemies off a roof is too much.
- Dashing across the battlefield and shoving an enemy into a bottomless pit to end a combat before it even starts is badass, but it makes more sense as a badass strategy available to level 2 fighters and rogues, rather than the default best strategy for every character. When enemy archers are giving up their to attack to charge into the midst of my party to shove, it's probably too powerful.