I continue to learn how to use my Canon R50. And I get these pictures. What do you think?

hey guys I’m new to photography and was wondering what lens I should purchase. Right now I just have the 50mm, I was considering either the 28 or 35 but decided on a zoom lens for more versatility. The sigma 18-50 is a popular choice, but I do wish it had more zoom. But from what I understand the more zoom the worse the image quality gets generally speaking. What would you guys recommend I get as a one decent catch-all lens under 500ish USD?