First of all, Dany, welcome to the group.
In phalaenopsis, the flower spikes and roots tend to emanate from pretty similar locations, so you have to be patient and check the shape of the nub. If it is smooth and rounded, it is likely a root tip. If it looks like a little mitten, it's likely an inflorescence.
As far as encouraging the growth of either one, you simply need to provide good culture.
It's hard to say for sure, but it appears you're growing it awfully dry. Phals prefer even moisture, but like all orchids, require lots of air to the root system. You've probably read that "orchids must dry out between waterings", but that is only true if they're in the wrong potting medium for your growing conditions. You might take a moment to READ THIS.