Climbing the ranked ladder

Hi community. First of all I would like to thank all you who take the time to read my issues and help others.

At the end of season 5, I was able to reach a ranked level of plat 1. ( I decayed to plat 5 after not playing for a while due to school work) and finished in plat at the end of the regular season and maintained it in the pre season leading up to season 6. Ever since the offseason, I feel as if I have hit a wall. I am unable to climb quickly like I have expected and am stuck in gold 5. I'm not a toxic player whatsoever and never rage and my teammates. That alongside that fact that I have spent countless hours researching and learning from people that are better than me. I watch streams and videos from players and I feel that their advice is something that I already do and apply. Yet I'm still here in gold 5. I feel that I need help and I am open to criticism if it can help. I feel like I'm making a key problem that I may not be realizing and hope that you guys can help me to find it. Please and thank you