Slacker boob probs🙈

My left side has always produced less and had slower let downs but I have pushed through and had LO always nurse on it first upon waking in the morning or after naps. This has worked for us up until recently. Off and on over the past few weeks, he has been trying to flat refuse nursing from it except for in the middle of the night (when he is super drowsy, I assume). He seems mostly just too distracted by the world around him to wait for the slacker to let down🙈even taking him to a dark room won’t work anymore and I risk him biting me out of annoyance. He will still nurse ok from my right side 99% of the time though. Having to pump this side more in the last couple weeks than I ever have thanks to his refusals😩super frustrating. Any other bf Mamas experiencing the same or have any advice?