Help! I’m a dev who can Software Design..?

Since it has not yet been released, I do not wish to go into too much detail here regarding the underlying technical data and specifications. It functions as an agent—and that is precisely what it is.
In terms of design and user interface, all theme properties will need to be enumerated, and compositions must be generated through programmatic UX design. A modern, sophisticated aesthetic is desired; 3D effects are welcome, provided they are not major resource hogs—instead, a compact SVG format should be utilized. The theme in question is “Dark Ocean Glass,” and it is due for a thorough polish. What steps can I take here? What would help me move this project forward? Strict design consistency is not strictly mandatory, as complete “factories” already exist for all layers and systems; only the development of the theme’s specific design elements is required.
As an incentive, I would be happy to offer a test version for evaluation. As mentioned, this is still pre-release. The enchanting Genie…

Broadly speaking, the task here consists of ensuring a modern, clean design that also meets current compliance guidelines.