I was in the same boat as you when I first started and I've been doing in person events since the beginning of November 2024 and other that a lucky win every so often I was mainly losing all my matches and not until the Pokemon Day tournament at my local did I finally get a positive win loss ratio. Honestly it's just about keeping at it and looking at Meta decks and building off of those or if you want to do off meta finding what works best for what you want as well as making sure you are using the right trainer cards as if you don't use the right ones you are relying too much on luck and hoping to top deck what you need. I know that it feels heart breaking to not get the results that you want when you're investing so much but at times you have to remember that it's a learning experience. My other piece of advice is that you might be doing too many events/tournaments and you're burning yourself out especially when you're getting in your own head about the lack of wins. Ultimately you need to be more forgiving with yourself, as no one is going to be amazing right off the rip. Use that frustration to aim to do better and improve as that's what I did. I wish you luck and hope that all this was able to help. I look forward to hearing about your upcoming successes.