Here's my advice (I'm a novice)
1. Be a good sport, win or lose.
2. Be humble
3. Watch some videos on YouTube, especially on openings.
4. Learn one specific lesson in each game you play...something simple that you will remember. If nothing else, study your blunders on the game analysis.
5. Don't take losses personally.
6. The purpose of ratings is to make sure you are matched appropriately in your games, not to make you feel superior or inferior. For us mortals, there is a whole lot more room above us than below, so if you are one of us, say between 200 and 1500 or so, just be proud that you have the guts to show up and put your ego on the line. That's more than a lot of people are willing to do.
PS. When you start improving and decide you really want to go higher, then get advice from someone other than a novice.
I am 1900+ rapid player right now and this kind of sound familiar because when I first started playing chess in 2020 I only played tons of bullet chess for 3 months or so before I decided to improve my game and got a copy of chess fundamental by Jose Capablanca which is really the point, doing tons puzzles and playing tons games won't actually get you anywhere if you lack the fundamentals basics. You can get a friend, a coach, a trainer, books, or even get interactive chess courses online, or just do it the old fashioned way chess.com lessons for beginners and it will just be matter of time before you start competing against player like me and who knows one day you might even get a title.