[...] But there's a lot of characters that the MC already got sexual with that I feel getting ignored a little lately. [...]
But, consider how little game time passed in last few updates, or even since the beginning. When I downloaded part one (roughly halfway through) some weeks or maybe even a month or more passed in-game (I don't recall/think it's even been two months of game time in the few years the game has been made). Recent updates have had much more happen, sometimes without a day even passing. If some months happened of game time with what you described happening (mainly getting new maids and not more major characters) I might start to agree, but that simply may not have even happened.
For example, since early on in part two (maybe part three next update) Cintia's story has been progressing with her planning to have a boxing match then presumably another date with the character, but for the last several updates, so much happened in those in one or just a few days, that they haven't even gotten to the boxing match yet, but I'd guess is coming very soon, maybe next update... and this is in relatively short amount of game time.
So, I disagree with your analysis. I don't think it ever happens that a game week goes by without the main character having sex with multiple lady major characters, but I don't recall/think even a week passed for several updates. That's not bad, because there was more story to be had before leaving, then the journey, with plot during that, then the continued demon war at the capitol. All this makes for a more interesting story (I don't think it needs multiple sex scenes in every update, because fighting action is good too).
Game time tends to pass more slowly than real time, because of the amount of work it takes to do writing and three-dimensional (3D) rendering; please consider that also. Maybe some people would say it's too much detail (in part one sometimes showing several meals in a day, with important discussions though) but sometimes there's just more events or other action... if entire 16-hour days of activity time happened, one might be wanting it shorter, but I think several updates in which only a few/many hours or one day passes isn't too excessive depending on events.
i do think you stuck a decent balance though,enough main girls with story, the maids are mainly side girls and don't get much backstory/screen time but still enough to not make feel empty and boring [...]
Yes, as I hope I described above.