Don’t try to sub almond flour for the coconut flour; it won’t work.
Psyllium husk is essential to the recipe. Ground flaxseed won’t work the same way, so it’s not a good substitute.
The water has to be warm when added to the flour. Cold water will make for a crumbly dough.
If you find the naan breaking when you try to flip it, let it cook for some more time before you attempt again.