Coconut bread dough is crumbly and does not come together to knead
You can't substitute a non-wheat flour for a wheat flour and expect similar baking properties; bread doughs rely on gluten for their structure which is why gluten-free baking is difficult.

The simplest way to fix this would be to double the recipe, look at what you've already added, and add more ingredients up to the correct amounts. You can freeze bread dough which helps mitigate the 'too much' problem although I appreciate it might get you through your ingredients faster than you'd want.

If you're dead set against that, add more flour in small quantities and try to knead the dough until it has a workable consistency, and see how it comes out.

For your broader desire for the bread to have a stronger coconut flavour, consider buying coconut extract or essence and adding that to the original recipe.