What's the best way to display a gallery that I can organize by colour, yet keep up to date?

Hello friends, I’m working on my photography and design portfolio and I’m going for a sort of early Y2K web feel with lots of mismatched elements and a chaotic feel. As it stands, my “gallery” is simply a large selection of loose images haphazardly strewn across the page organized by colour. I quite like this style and want to encourage viewers to explore the page, but any time I add new photos, I have to manually move ALL the images below it which is quite tedious. Also, the page is not very responsive to aspect ratio changes. This is on Wix Studio, by the way.

Is there a tool or a way to create a fun, dynamic gallery that I can easily organize and update? I dislike how the built-in galleries are affixed to a grid.

The website is www.jtrottier.com if anyone wants to have a look.

Thanks!