It's cool to see the step by step process 👌
Good to know that you liked it.
Lovely pic 😍
How to background black ⚫️??
After selecting colour pop(and saving the image), I reduced the shadows to negative 100(max left), increased contrast a bit, inside galaxy edit. Then used Lightroom app to do the same steps(repeat) and increased the vignette tool to maximum (Lightroom app).