Well, he actually already did this by creating his second game - MILFs of Sunville. And, unfortunately for him, it is not as popular as Fashion Business even after 1,5 years of development. It now has about 750 patron and Fashion Business has about 1400. Fashion Business is almost twice as popular.
And actually it is not so surprising. Most adult games here fail. People don't like the story, the character or whatever, and as a result, the game doesn't make enough money.
Certainly, Decent Monkey can end Fashion Business in a couple of updates and start something new, let's say Movie Business. But there is no guarantee that it will be more profitable. The opposite is more probable, it seems to me.
Yes, Decent Monkey lost quite a bit of support after February 2022, partially probably because people from Russia can't support him anymore, but it is still a very profitable game.
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With regard to your idea that the game doesn't attract new people because Ep.1 is rather weak both in terms of quality of renders and grind, it is probably true to some extent. Maybe Decent Monkey should make Ep.1 Remastered with new high-quility renders and animation and less grind. This can work.