I have an idea to get supports more into the game!
The first idea is kind of sketch but it goes like this. After level 6 supports get 25pct increased xp. Mainly because if you look at any game near or at end game supports are generally 2-3 levels behind. They lose a lot of xp roaming and ganking other lanes after they reach 6. No, I am not a support main but I do support once in a while and it feels bad when you're supposed to be a "tank" but the Enemy Shyvana is 3 levels above you and you can't do anything as she tears your team and whatever little armor you have apart.
The second idea is more of what I would REALLY like to see. I think adding a whole new score to the game would drive people crazy but I feel they'd love it after a while. I think supports getting 150-250 gold (depending on severity) for saving their teammate should be a thing! Like if 3 people jump on the ally ADC and thresh throws a lantern over the wall ADC grabs and is safe, 250 gold. Or if your mid lane is getting chased down and Morgana happens to land a Q and put E on them to safety 150. I feel like it wouldn't be an overpowering idea to add to the game since these situations don't happen ALL of the time and it'd be nice to see what supports can do when they're caught up with the rest of the game. Generally the only way you'll see a support caught up is if their team is just demolishing!
Well let me know what you guys think and have a nice night! :)