Straight up coconut oil is not a deep conditioner it is a deep treatment so largely improves hair from the inside out, conditioner has ingredients that patch or coat the surface so make hair feel nice from the outside. Coconut oil probably won't absorb on wet hair since it is water repellent, the research is a long overnight up to twenty four hours on dry hair. You may feel a difference the first time, more likely you will need multiple treatments to get the benefit.
That is quite a lot of sun, IIRC less than 200 hours UV exposure damages the protein structure and cuticle glue and, hair becomes more porous and strength is reduced substantially. Could you wear a close weave sunhat or UV Buff? You might want to focus any protein and/ or coconut oil soaks on that area, ceramides are also beneficial for UV damaged hair.
I don't think many of us are methodical initially, even with method and science there is still trial and error, it just reduces our options and stops us making so many expensive and frustrating mistakes.