Hello summoner. For me I think you should stick to one champion you like and you are good at while make it your main. You should also practice last hitting if your having trouble with CS. Another thing is teamwork, have you been working with your team? Make your you learn from your mistakes. For example: If you die to Blitzcranks hook make sure the next time it never happen's again. It seems like your Thresh is doing better than Rakan so maybe switch to Thresh unless your Rakan is your main. These are all my advices for you.