Sorry
@noidea but is this just a seed slung into a pot n dumped in sun and watered now n then?!?
Tbh you kinda need some way of checking PH of fluids going in : its an
absolute must: even the acid test paper strips for a couple £/€/$ will do
As for the mix, a couple things of note:
1. The compost will possibly hold nutrients (but maybe not!!) - is the plant getting food at all?
2. Depending on how much coco, will also impact how much water and how frequently you need to renew that water - from daily to every 3/5 days?!
As an additional are you supplementing with any nutrients or amendments?