Well, at some point you just have to in order to progress. There is some contingency based on whether your opponents are 'booked up' and nabbing you regularly in tabiyas you're allowing or playing. Some lines, for better or worse, only have a couple moves that work and those have been determined because every other move has been played. Some openings have forced draw lines. Do you know of them, play them, allow them?
You don't strictly have to go full on gonzo must inhale the entirety of an opening -- but you can start by choosing an opening that you're fond of and play regularly and pick up a book on it and try to get better at it. You sound like you've progressed organically to this point and while you're enjoying the process just add the opening book to the mix now and then and see how it goes.


Seeking opinions:
New players are learning not to drop pieces. After that I'm told studying/practicing tactics is most important. Also maybe basic endgame knowledge. At approximately what rating should one begin to study openings and develop a repertoire? Or at what rating is such study necessary for further improvement?
I've never systematically studied openings. I know general opening principles and from years of playing I've caught on to 5 or 6 moves in many major lines of major openings. But I'm deciding whether or not to make a serious study of openings.