System data takes 300GB of my total 500GB Mac SSD

Is there a way to fix it? Isn't it weird that we can't control this, all I see on the blog pages are expensive clean my mac kinda apps.

I hope there is a way to fix it. It wasn't like this before 1-3 week but suddenly "system datas" took all of my space (300GB) . This is so annoying.

Thank you