How does one fix the issue that come from being a support?

I'm honestly looking for ideas on how to fix the issues that come from playing the role. These issues being that you are basically always behind in experience, gold, and general solo power.

Some suggest making the support items better/cheaper, which sounds great until other classes start using the super strong super low costed item (why should the ADC buy when item X costs 600-800 less and trades 15 AD for 20 armor and 20 MR).

Others suggest giving supports ways to keep up gold wise. Again sounds great but if i can stay within 100 gold of my ADC despite barely last hitting, then why wouldn't i just play a second ADC? if it's a rune of some kind... lets say "minions killed by allies grant 50% gold to player" you risk a meta where 4 people get the rune and everyone crowds a lane. lane generates 300% gold and the game is more or less decided by which team can snowball faster/ win 1-2 team fights in the early to mid game.

You could make support runes powerful, but again if they are too strong you get cases like and abusing klepto. Or / getting to proc Aery multiple times per DoT duration. I know there will always be champions who happen to have synergy with rune/items/etc... that were not "meant" for them, i just wish that there was a better track record of dealing that that champion rather then making the thing they abuse, but another character needs to function, weaker.

Finally there is the issue of champions getting nerfs because an item they synergize with, that others basically never got, finally ends up being meta. I like to use and as a great example for this. Sona was totally able to build the item and buff her whole team, and no one really batted an eye. comes along and starts using it in the LCS and all of a sudden the item is meta, it's busted, everyone is rushing it, got to pull out the nerf bat for it and/or champions who use it. It has always kind of bothered me that certain champions are considered "healthy and fine" for months if not years at a time, and then the meta changes and all of a sudden the champion is "toxic, unhealthy, and abusing game mechanics". Nothing about the champion changed, nothing about the items they build changed, sometimes nothing about their bad match-ups changed.

So how do you go about making supports more viable/ fun without risking other champions abusing the tools, which then leads to the tools being nerfed and supports being in a worst spot then before, because why punish the people abusing a loophole when you can bomb the whole thing from orbit?