there is something you can do! CTA (call to action), and in your latest video you had an miss opportunity to ask people to subscribe to not miss any future content. this spot was during your transition from the car to your house, a simple "alright guys, I'm going to head home now and in the meantime, go ahead and smash the sub button and ring that bell so you don't miss any future content!" (and then some B-roll of some driving home as you said that so the viewer doesn't miss any content as they do your CTA) A proper place that seems natural with the flow of your video within the first 30-60 sec of your video will turn those views into subs.