I am not a pro and haven't done very much media, so you can take my opinion with a grain of salt....but,
Making money in U/W photography seems very difficult, and the quality of the photos are only part of the equation. Your photos are good, but not outstandingly unique. They are within the spectrum of acceptable exposure, but they are a little bit less exposed than I prefer--but i could be wrong as i am looking at it over the web on laptop outdoors. If you were taking photos 150+ days per year they undoubtedly would get better quickly and perhaps you would find a unique and identifiable style.
I gather from talking to others and personal observation that there is very little money in the photos themselves even if you are relatively successful in the media. A career in photography requires building a brand around yourself as much as it does selling photos. When you look at someone like Alex Mustard, from appearances he is not only successful selling photos, but also selling workshops, trips, etc. I would speculate that this success comes from endorsements of people who have taken trips with him, extraordinary engagement with the online community of u/w photographers, success in teaching techniques both in person and in his writing, experimentation with techniques that occasionally lead him to a new technique that leads to unique photos.
I don't know Alex personally, so if this is inaccurate I apologize. It is only my speculation.
A good way to see how your photos are stacking up against other amateurs are to place them in the various free u/w photo contests: Wetpixel picture of the week, Dive Photo Guide picture of the month, FINs magazine flickr group picture of the day. Or the larger international paid photo contests-BTS, OWU, DEEP, LAUPS, NCUPS, etc. Photo contests are humbling, because even very good photos lose. But they have made me more aware of the differences between good photos and great.