Hi and thank you for kind words!
I'm planning on making more UI related assets when I find time to do so.
Is there something specific you would have needed?
I don't currently have that much icons, or know what kind of game your making but I would look for icons that are simplistic. Because its going to be easier for the user and you will be able to customize it easier if needed. :)
I think Unity Asset store has a lot different kind of assets you can use also outside of Unity.