The targeting and range allows the spell to include the caster but the text calls out allies as the ones that get the benefits.
You are your own ally unless stated otherwise, so anytime you buff you can buff yourself too!
Ally: Do you count as your own ally?
You count as your own ally unless otherwise stated or if doing so would make no sense or be impossible. Thus, "your allies" almost always means the same as "you and your allies."
ah thanks.
Targets one creature/level, no two of which can be more than 30 ft. apart
No mention of allies here.
Blessing of Fervor can affect anyone you want, within the stated limitations. You, allies, enemies, neutral parties, etc.
You can pick any targets you want.