Hello Olivia,
I had the same concern selling stuff from different categories before, too, and had even created a thread about it, too! The conclusion I have gotten was that as long as your shop looks cohesive with all of your items, you should be fine :) Besides, more items targeting different buyers can actually drive more traffic to your shop. Also, it seems like most of the people who visit my listings come by searching the keywords, so they probably already know what they want when they land on your shop instead of browsing and shopping as they go.