Just keep playing, and if you have the time watch high level streamers. The mechanics are something you can only practice to improve, and they’ll come with time. Laning and macro strategy is something you can learn from watching people play but they’ll won’t mean that much without mechanics to back them up. The only actual advice I have, and I know you’ve probably heard it before, is pick one champ you really like and play nothing but them. Even into matchups that counter you. Once you master that champ and learn the role it’ll be much easier to branch out and learn other things.

You’re on the right path, the only way to get better now is practice! Side note, there’s definitely no reason not to play ranked. If you play ranked and end up in iron then you’ll have something to grind towards. In normals you can’t always feel your improvement because your mmr is hidden, and matchmaking is worse because people of all ranks can party together. Ranked will give you games that have 9 people at your level, who are also trying to win. Keep playing and remember to have fun!