Martial Arts Adept (Grappler Revised)

You've learned close quarters martial arts. You gain the following benefits:

• At the start of each of your turns, you can deal 1d4 bludgeoning damage to one creature grappled by you or whenever you succesfuly shove a creature prone.
• Whenever you make an attack of opportunity, you may instead attempt to shove or grapple the target rather than make an attack.
• Whenever you successfully grapple a creature, you may shove it immediately after as a bonus action.
• Whenever a creature you can see moves into a space within 5 feet of you, you may shove it as a reaction; unless it also possesses this feat.