Well, I know it's not that impressive but I wasn't playing chess for months because of work. I started playing regularly again 2 weeks ago, I was also 1800+ in lichess. Joined this community to start from scratch again. My goal is reaching 2000 on chess.com. Working for tournaments. I still have problems about stress control etc. Any tip will be helpful. My advice would be, don't try memorize everything, opening theories etc. For anyone under 1600. Try to understand why that moves played. This way you can memorize better and improve your play.