(Is the dev here? I'm gonna give him GOLD, for free).
IMO, it's time for the game to end. He needs to move on to a new project. Then he can pour everything he's learned into the new game. However, before making the new game, he needs to poll his existing patrons to find out exactly what content they're choosing in game. Which is the most popular? Netorare? Cuckolding? Swinging? Having Anne all to yourself? MC fucking other women? He needs to know for sure, then he can use that data to help shape his next game, with the goal of doubling or tripling his patron count.
I think his new game should focus purely on the most hardcore, and ruthless Netorare and Cuckolding, UNLESS he's that passionate about Swinging. If Swinging fetish is something he really, really likes, then yes he should add swinging, but that automatically means needing to add 1 on 1 sex between the husband and wife to preserve immersion, and the more genres your game spans, the more you'll need a pipeline/methodology to make sure content creation doesn't take 4-6 months for each update, long updates are devastating for higher patreon subs IMO. His existing methodology has too many girls, too many genres, but without the pipeline/methodology to support rapid creation of content, so the updates take way too long.
If he goes purely Netorare & Cuckolding, then all he has to worry about is designing one really hot woman, that's it. Updates should be faster too.
Of course, if he polls his patreons, that data could potentially prove me wrong about my assessment, and omg, if he shared that data with the community, it would be so helpful.