Tanning Plateau ….. any suggestions?

I currently use Paint it Black 50x lotion, before this I used Swedish Beauty Swedish Intensities(however its spelled) and Dark Knight 30x. I have gotten to a point where Im not getting darker but I have not reached the goal I was shooting for. My skin is pale naturally, but I know I can get it darker than this… any lotions that could help out? Or any ideas?? For the people who are going to criticize about skin and tanning, please dont waste your time commenting. Its my skin, I dont need you to tell me what I should do with it. .. Thanks!! :)