Mozart bores me for some reason.  I don't know if it's because it was overplayed when I was young, but I really flatline in the enthusiasm dept when it comes to his music.

I do think you're leaving the realm of the beginners and it gives me something to look forward to in a few more years.

Might I suggest you look at Bach's Brandenberg Concerto No. 3 once you get this Mozart piece down.  It's fast enough to match any jig and can be done solo.  (With a background tape.  Otherwise you're going to have to figure out how to swap from first violin to second and back as necessary.)

Also, when busking, listeners like to hear stuff they're familiar with.  Classical music in the US doesn't go over as well as show tunes and top hits.  That doesn't mean classical won't fly, it just means you have to choose pieces which mimic modern music.

Bach's Brandenberg No. 3 is one because it can get toes tapping.  Meditation from Thais is another because it sounds like a love song.  Offenbach's Tales of Hoffman, Barcolle is a 3rd but there are others out there.

No one wants to hear a busker playing Paganini's Caprice 24 so you have to pick and choose based on how close what you play is to the target genre of what people like.  Failing to do that means that your audience will walk around the corner to listen to, clap for, and give money to, someone playing something they recognize even if poorly done.