Shove as a Bonus Action

Using a bonus action, you can make a special melee attack to shove a creature, either to knock it prone or push it away from you.
The target must be no more than one size larger than you and must be within your reach. 
Instead of making an attack roll, you make a Strength (Athletics) check contested by the target’s Strength (Athletics) or Dexterity (Acrobatics) check (the target chooses the ability to use). If you win the contest, you either knock the target prone or push it 5 feet away from you.
Inspired by Baldurs Gate 3.