No one will probably read this but if it helps one person I'm fine with that. I made a thread about me being all happy how I just achieved my goal from bronze to diamond in a season and some people seem "amazed" because its a huge improvement fairly quick.

The first step to improving in solo queue is knowing you WILL run into trolls/feeders/afks. Just knowing it will happen helps your mentality so you don't go on tilt. If you are frustrated in one game you'll carry it on into the next. Just don't get angry with it, every game is different. The second thing which is very important is warding and objective control. I literally think this is what helped me improve the most. I ward like a mad man no matter what lane I'm in "not as much if I ADC". If you back and you have 150g buy 2 wards or a pink ward. They DO save lives and let you know if the jungler is coming, if they are preparing for baron/dragon. They are the most useful thing in this game. The third is just work as a team. You aren't going to win the game by your self. Knowing your team comps is VERY important. For example if you have a Pantheon top, jungle Lee sin and Corki ADC that is a early/mid game team and you need to take advantage of your power spikes. Knowing your team and its potential is very important! Communication is key to winning. If someone waste flash in laning phase use that to your advantage tell your jungler it's down and you need to kill him within 5 minutes. Most of the time they will come and at least attempt to and hopefully it will turn out in your favor.

These are basically the biggest things that helped me improve. Of course there is more like mechanics and remembering your laners CDs on every spell and when to engage and not to but these are the simpler things you can improve within a day. Good luck in the new season and follow these steps and you'll achieve your goal eventually!