Rotating Game Modes/Other ways to play the game

Throughout league's history, many game modes were created like URF, Doombots, Hexakill, etc. If able, may we get back rotating game modes added back or some way to play these game modes in custom matches. It feels like a waste of time to release these game modes just for them to never return. I personally liked the PVE events like the Odyssey and Star Guardian events.