We were never given the spirit of fear but of power the bible says:
2Ti 1:7 For God has not given us the spirit of fear; but of power, and of love, and of a sound mind.

Power, boldness is already in our spiritual DNA as the bible says in
Pro 28:1 The wicked flee, though no one pursues, but the righteous are bold like a lion

It is always the wicked who flees or is afraid but not those who have a right standing with God. Like God said to Joshua we should be courageous because that's what we are made of . The moment we fail to recognise that is the moment the devil gains advantage over us