Essential oils can have effects on a person, intended or unintended.
Scents in soap do not last as long as fragrance oils.
Do not use cinnamon oil.
You do not need to dilute essential oils with a carrier oil if you use them in melt and pour.
Lots of variety.
Scents in soap last longer than fragrance oils.
Only use soap safe and skin safe scent oils.
Any oil containing vanilla or vanillin needs either a vanilla stabiliser or a vanilla stable base to keep the soap from turning brown. You could also make your soap a color where more brown wouldn't hurt or be noticed at all.
Do not use cinnamon oil as that is an irritant.
The manufacturer should give you a maximum safe usage rate. For the soap itself the maximum is about 1 flat teaspoon of combined liquids/butters/oils (excluding alcohol) per pound/500g of soap base. Therefore your maximum usage rate in soap should be the lesser amount of these two.