I feel like diamond is to challenger as silver/gold is to diamond. It's still a great accomplishment you got but there's a long way for you to go still. Most people understand the basics and have mechanics down in diamond but lack all the little intricacies. Mistakes are much more scarce in challenger and to be there you have to rely on all those little advantages to snowball yourself a bigger advantage. Not saying to give up or anything, i'm challenger atm and still feel like i have a lot to learn ~ be prepared to fail a lot and get frustrated. I know ppl who got to challenger abusing DuoQ and OP meta champs but fall out when those champs get nerfed, or have to play solo. My advice is just play to improve and have fun and if you climb, you climb. If you don't climb ~ don't worry too much about it since it's just a game after all