Dutasteride in addition to finasteride

I currently do 1mg fin a day, so 7mg a week. I’ve been thinking of starting 0.5mg dut once a week, so a step up on your scale I guess. My main question is this; I’m 23 amd started a year ago and have had fair results. Should I wait until I start losing ground again before adding dut so as to not get used to it earlier, or is earlier better?

There is no need for finasteride if you are going to use dutasteride. You just increase the risks of side effects by doubling down.