How do i get to Master

Im a D2 player trying my best on Lillia, i play lots of Viego but i get mostly master players in my games and i get kited so easily and it might just be me being bad but getting a lead gets so hard on Viego and im also not enjoying its much as i did before so i wanna play more Lillia and ivern as i just enjoy those two a lot more.

My coaches told me my Vieho gameplay is really good i just do a little too much dilly dallying. I have a hard time balancing farming and fighting because i just feel like the enemy jungler often waste so so much time but they still keep a lead.

I want to be at so many places at the same time which i feel is hard to balance on Viego, on Ivern its easier.

So how do i give myself the edge on Lillia? I appreciate any help!