Your hair type (the number) is far less important when choosing products than characteristics like porosity.
I simply use a small amount of my conditioner as a leave in. Many people do. If you like your conditioner, you can try that and see how that works for you.
Hair type: 3b, normal porosity, medium texture
co-wash and rinse out: Inecto coconut conditioner
leave in: sHegron Aloe vera conditioner or Inecto coconut conditioner
styler: L'Oreal gel / mousse
Currently experimenting with home made flax seed gel (latest version with agave syrup and gelatine), home made protein treatments (latest version with gelatine and coconut oil)
IHerb code: SGW867 (up to $10 off)