Not sure if such topics already exists.. if so let me know..

After you revamped exploration.. making us hunt different races on different areas  each providing different sub areas separating grades range..(with related difficulty) i think you should remove Sebastian slave selection as it would be a fun breaker.. i already dislike it.. too easy to get what you need.. if you have gold..

For laboratory.. you should restrict body parts modification.. to the races you only acquired once.. it would make us hunt for a specific prey.. to unlock its race features..  also with a certain laboratory lvl when you make someone pregnant. you should be able to select a few thing from the mother (automatically inherits looks description with random breasts/butts and sometimes lower beauty) but picking up 1 trait could be a big improvement.. i used like 500+ days with 6 breading servants to get right beauty lvl/trait(just 1) the original mother had..

Maybe adding armor/weapon crafting/tinkering.. making you mine/harvest in exploration or unlocking those location first then send servant to do it.. then make a servant craft/tinker those (could further extend those with better ore/materials to generate better armors/weapons) even creating trinkets.. other than gold ring there is nothing else i think.. or upgrading one you already have with magic or other things..