Why I keep leaving league (AND why I keep coming back)

So over the last couple months I've been putting league down for weeks picking it up for a day or two, than putting it back down again. I think for me that this is because I feel like I'm never getting better. Games are routinely (60-70%) blowouts one way or the other with an ff@20. Getting stomped or stomping does not make you feel like your getting better. Major leaguer's would destroy a high school team and I doubt anyone learned a lot from that disparity. But even on games when its close I still don't feel like there's an improvement. My dmg may be higher or lower, my cs may be higher or lower, my tanking (dmg taken) may be higher or lower. There's no concrete way to know what you did that was better; why this close game went in your favor when the last one didn't.

why I think getting better is important: Getting better in a multiplayer game is why people play over a long period of time. Individual games may be fun, but if your looking for diverting entertainment there are better options. League is different because you can improve, notice a play you did better, or a decision that helped a play later happen.

Why I keep coming back League is fun DUH!!!

My idea: Practice leagues. Let's organize groups of players who feel like there skill levels are similar and let them play against each other. Than let's review the games and talk about what went right and what didn't.

tl;dr I need people to practice against cause I like playing league but I get bored with stagnant improvement.