Riot, can you please allow some sort of MMR reset in normals?

Back in seasons 4/5, I try-harded in normals to get prepared for ranked. That worked out great (I went 8/2 in my first placements for silver 1, making a short climb to gold).

I now try to play a mix of my mains and also trying new champions in normals though. I used to be able to go to team builder for new champions and have garbage MMR there, but now I'm stuck in normal draft.

And guess what happens?

My first game as Galio: I'm against a team with 4 diamond and 1 plat player (I'm only plat in ranked, and that's playing my mains). My second game as Galio: My lane opponent is diamond. My third game as Galio: Lane opponent is also plat, but enemy bot lane are both diamond. My fourth game as Galio: My lane opponent is Challenger (yes, not kidding, actually currently in challenger).

It's funny how when I come to normals to pick up a new champion, I can't get a game without a diamond+ player on the enemy team. All because I did the smart thing and played hard in normal draft to be ready for ranked FOUR-FIVE SEASONS AGO. No wonder my champion pool is so small. I get so discouraged trying any new champions because it's not only that I do poorly on them (which against any opponents you might expect?) but I don't feel like I'm learning anything most of the time because I'm getting pubstomped by players that would likely beat me on my mains. At least if I was playing my mains I'd know enough about what I was doing to learn something in those games.

So I ask: Can't we get an option to lower our normal MMR or reset it partially each season? I understand that you want to keep decent matchmaking, but you do ranked resets?? I'd like to get the opportunity to play new champions and learn them before bringing them to ranked, like almost everyone else does...