Let's face it, minigames are dead content for the most part unless you're starting a fresh account and even then they phase out quickly. Let's make Minigames great again.
Elite Minigames:
Add a higher difficulty, higher return version of certain minigames.
Barrows - tougher brothers
Dominion Tower - remove cutscenes, add more bosses, death is a restart
Fight Caves - more waves? suggestions?
Possibly Fight Kiln - no cannon? suggestions?
Monster Carnage - tougher rooms
Pest Control - spawn all portals, remove shields, death is permanent (can't respawn)
+ other suggested minigames - suggested difficulty increase
Other than the minigame points below, individual elite minigames should likely get buffed rewards as well. Probably double the normal rewards, possibly stacking with weekend bonus?
Minigame Points:
Add Minigame Points to every completion of an elite minigame
Add a Minigame Points shop that sells Battle Royale auras for a high cost, increasing for each level
There's a potential plethora of options to put in this shop, I just know that the auras from Battle Royale are fantastic additions that almost no one has because that minigame is hard to get going. It makes sense to have a great centerpiece reward to work for too, like the forlorn shard is now.
Everything here can be changed, but it's important that we get the difficulty and rewards right otherwise we're back at square one.