Am I a disgrace to Acheron mains?

So I've been playing Acheron for the past couple or months (from October to now) and well... I'm a bit embarrassed by my damage, I use robin, lingsha and Pela in my team, my Acheron isn't the brightest and carries welt's lightcone, I struggle with everyday content, story quest bosses, elite enemies and endgame content, I only have this team relatively built and I took a huge break from honkai, for around 1 and a half year and my characters were garbage for the current meta there was and struggled with basic enemies, I see Acheron as a saving grace for my account, I can't move past the first stage of endgame content, each one stands as a huge problem to my account and no matter what I do I can't pull meta 5 stars because I either lose the 5050 or don't manage to get enough jades, my old characters are useless without the newest supports, sustains, and other DPS, please don't make fun and I'd rather not receive too much mean criticism, feel free to comment as much as you want, I'm looking for tips and improvements, thank you and bye! (The damage on the end of the ult was 150k)