I tend to play Lux a lot and I would say am pretty good/decent at her. I know she's not a high win rate champ but I hold mid with her which saves my jungler time to focus on weaker lanes. I also roam a lot with her especially topside or jungle to get those guys ahead and stronger for late game.
I also have a timer worked out for baron steal that can take it from the enemy smiter, so most games I end up stealing baron two or three times which gives us an edge.
With that being said, my weak point when I play mid, is my farming is weak. I can't seem to farm really well so I think that is what is hurting my game. I think this stems from that I was mostly a support player since the beginning. However, I gave up on support as it can be frustrating watching your ADC run (flash) into enemy at level one while they have heal up and die and continue to make ridiculous plays. Or refusing to freeze lane so that the jungler can gank for us or just down right being annoying. I go full support so I can't really carry bot lane with my support items.
As support I play Nami or Soraka sometimes Braum.
What is your advice in these situations?