First time taking a flight this April, need some advice.

This April I'll be taking a flight(Hyd to Delhi) for the first in my life, to surprise my bf on his bday! I wanted to know which airlines would be better and genuine, and also should I be book the flight now itself or shall I do it next month that is march. I've been noticing the flight prices they're always around 4 to 6k, 4k is always akasa and the rest are indigo and air india, so I'm thinking will the prices go down a bit next month? Or will they stay same I have no idea, if anyone has experience and could let me know some info thats needed to keep in mind, I'll appreciate that, Thanks in advance!