Play normals until you win before queing for Ranked, and always take breaks if you aren't having fun. Find a duo partner who plays champions that your champ synergizes with. Play champions with strong engage like jarvan or sion so you can dictate when a team fight should begiin (likewise champs with strong disengage like gragas and Janna are good for the same reason). Watch streams of high elo solo que (don't watch the pros, thier 5s meta is too different from bronze for you to learn much). Use wards, don't rage, play champs with good utility and scaling so you can still contribute when behind, know when to take objectives, farm, and split etc etc etc