But you can level up your skills by using them. If you want i post you a Screenshot with my almost maxed out Johny. Either you encountered a Bug or did something wrong. Especially the Housekeeping skills grow really fast if you cook and clean yourself.
You can grow every Skill with the following methods:
-Teaching: Grows passively with every successful teaching lesson you do. Successful meaning your slave is very dilligent during the lesson. (Applys to any skill that grows by teaching)
-Stewardship: By teaching Maid, Cooking, Secretary and Elocution skills and by doing Cleaning and Cooking yourself. Tends to grow fastest.
-Artistry: By Teaching Dance, Sing and Music skills.
-Medic: By teaching nursing skills and by teaching Enema skills. And passively by having injured slaves at home. It can be beneficial to sometimes don't take injured slaves to the Technosphere.
-Fighter: By teaching Gladiatrix skills, winning Battles in the Colloseum, against your slaves or in the Fogs.
-Magic: By training Witchcraft and Alchemy skills and by using the highest ranking Spell you have available.
-Flagellation: By buying a Whip and using it in Battle. By teaching Ponyracing lessons and using Flagellation punishments.
-Torture: By teaching Masochism and Self-Harm (I am not exactly sure on that one) skills and using Torture instrument punishments.
-Binding: I am not really sure but Bondage punishments certainly help.
-Sex Skills: By teaching the responding skills, going to the Brothel and using Erotic Rewards
Keep in Mind it can take quite some time to level every skill up to an S Rank but don't give up. I hope this helps and you give the game a second chance. If you have questions just ask away!