My writing just isn't getting any better and I'm feeling kinda hopeless

I'm a kid so I have the time and energy to put in the work, but I just can't seem to make my writing better no matter what I do. I've tried writing constantly, I've tried a lot of writing hiatuses, I've tried writing exercises, I've tried getting a writing coach, I've even watched all the videos on the channel that has like a million subscribers that posts videos about improving your writing every 2 hours or something, and so far, nothing has ever helped. My writing isn't the worst ever, but it's definitely not even close to good enough to be published, and it's just starting to feel pointless to continue trying when every time I write something I can see how unpolished and poorly written it is. I'm just really burnt out and I don't know if I should keep trying or give up on all my writing dreams.