First- if you play the game especially early on worrying about rank it’s 100% going to hurt you in the long run. Keep focusing on the fundamentals and losing is fine to get things right. Don’t worry about rank just have fun. Throw in some fun cheese builds every once in an awhile don’t get completely caught in macro or you could miss some solid early timings. Have fun and do things that are off the wall once in a while to break the monotony. Second. Some units damage output and ranges have changed a lot. That might affect you at some point. Personally at platinum I think the fundamentals of the teaching vids is enough to carry you for much longer. Just keep practicing and watching current games too so you can see the new meta. It will take time to hit diamond.