ok so many devs have the same issue, it takes a while to get to the point in a game's development where they can push out content to satisfy people. I'm not sure if i suggested it before, I'm sure someone else has. you need side or non-main content to circumvent the long draw to main content releases. what i mean is you need side lewds to satiate those in the meantime. Rather easily done with these types of games with mode progression. In basic the character has a mode/level/whatever that they progress through; in this games case it's the training the MC gets. with that you can easily add side content separate to main content based on the mode. Pritty sure most get the jist of that cuase its basic trainer 101 pholosophy for these types of game.
that said, you game really lacks lewdity. you missing opportunities you can take advantage of to provide adequate stimulation to those playing the game that will keep them hooked. Most basic of these is costume or sluttyness/depravity of the standing rest or ragdoll the player sees of the NPC and MC on screen. if you simply progress these images, you can achieve a bare minimum of mode. If you want to expand it further, then you can add side events associated with these. (The most basic is simply just the standing rest or ragdoll costume progressing to new levels of mode, if adding events or scenes to go with this is too much then you needn't worry it's not required to have ether, but totally expected to have at least the bare minimum)