change 2nd role to adc.. pls tips

Hi everyone! I'm a noobie silver 4 whose roles are mid/support.. With the problem of getting her lane not even 20% of times. Until now when I really didn't want to support I inserted some random stuff in secondary, doing the best I could. But now, after reaching silver 2 gates and bouncing back for several times I think I finally am at my skillcap.. So going with roles I lack experience in isn't a "viable strategy" anymore. I don't really like top and I feel like jungle is a perfect role to main but not so good as secondary, as imo it's the hardest of them all and the one that requires the deepest knowledge of the game.

Anyway, I guessed I should learn some ADC.. Even because should I get better and come to an elo when supports are not so rare ( it even exists? :( ) or when hopefully queue trubkes will be fixed this would make me better when taking my original secondary back ( I love it, just can't play it 90% of the time:c ).

My pool atm is made of Ashe, Caitlyn, Sivir, Miss Fortune, Tristana, Ezreal and Jinx. I was thinking on focusing on cait as "safe pick", Ashe as utility one (teams without an engage are a real thing here in silverish.. ) and Jinx as carry ADC and to-go.

Any advices on the role and on the champions I chooses to pick? Are they good picks? How much hard are they ?