How would you suggest helping new players?

A while back, I had the urge to try and help new players improve and understand the game better, as well has to have fun doing so. It may seem silly since it's just a game and people learn the game just by playing, but since the game has something of a toxic community, I thought it might be helpful to have a friendly player to keep new players' interest and show them the game can be fun.

But this begs the question of how to do so.

A few months back, I made a smurf account named HereToHelp. The account was created purely to help players have fun and learn the game. As such, I made sure to never play in normal games, since that would ruin the enemy team's experience, and to nearly always play support, especially Nami and Thresh. Almost all the games I played were in beginner bot games, since that seemed to be where new players went to practice champions and such. It worked fairly well, but perhaps not as much as I hoped. Most games, the other players were not interested in the assistance I offered, and many times that they DID respond, they were mostly excited that I was feeding them lots of kills. Eventually I reached 200+ wins and nearly all my games were with experienced players. In short, I played so many co-ops that I don't get matched with new players anymore.

I can make a new account and do it again, but I was wondering if maybe there are alternative ways to help. Different modes that could yield better success, strategies to better interest players in having fun and improving.

Basically, I just wanna hear other thoughts on how to help new players. League's a great game, I wanna help show other players how much fun it can be.