Suggestions/Advice

Hello! I am currently looking for advice on how I should get out of Bronze based on my champion selections. I am a mid main, however I also am able to play support. I have a level 7 Ahri, Lux, Sona, and Janna. Although I have level 7s, it seems it doesn't do any good in low elo. I'm asking for advice on what I can do to climb. When I am mid, I focus on first tower gold then decide to roam depending on how the other lanes are doing. I know who Ahri and Lux are weak to, and if they get banned I have other mid laners to use. For support laning, I usually rush redemption after sightstone (unless I am playing Sona). Now that you understand my laning phase, what should I do? I was recently told to quit support in low elo and learn to adc (MF). I also understand I am NOT a gold, plat, or diamond player. I am in bronze for a reason. Please also keep in mind that I flame on very rare occasions. To be honest, I mainly just mute whomever is flaming in chat.

Should I focus on learning top and jungle? Or should I continue playing Mid, ADC, and support?

All advice is accepted. Thank you.