From what I can tell, with the bit of research I've done (which granted is not a whole lot), there are a few things you can do to grow a channel.
First and foremost, consistency, you want to consistently make 1-2 videos a day(ideally) for as long as possible, people see you're dropping videos daily and they're more likely to check back in and bring other people in too. Making videos less often can work, but once a week may not be the best schedule plan for you if you don't already have some attention already(Plus it seems like the successful channels that do once a weeks put so much more effort into their videos, animations, designs, big competitions, songs, etc).
Secondly, try to bring attention to your videos in relevant content and situations, for example one of my first videos was how to get a particular quest done easily on Dungeon Defenders 2, because it was relevant and more of the guide-sense, I linked it to the forums for that game in case other people found it helpful. Turns out at least 1-2 people got some use out of it. If you're videos aren't guidebased or something similar it can be a bit harder to get it out to the right people. I see that yours are regarding motorcycles, and, one in particular, was motorcycle repair. I would advise checking reddit for a motorcycle subreddit and posting there, since it would be pretty relevant.
Third, this one can be seen as kind of scummy by some people, but that is to, essentially, click-bait your titles. What that means is put titles on your video that are very tempting and interesting, but also relevant. Of course you want to make sure it's relevant, if you're video is aimed towards a professional/older/etc crowd, caps and flair may not be right for you. For example if your target audience was people watching cat videos, something like "THE 5 CUTEST KITTENS ALIVE TODAY" would get more attention than Jace the Mixed Breed Cat. Now you're doing what looks like Motorcycle repair and maintenence, could try something like "Repairing my Yamaha R6 Coolant Diag" for example.
Fourth, Collaborations, if you know people who do similar things near you, try doing a collaboration video, if you and someone else both collab with each other it generates notice for both of you based off both your sub/followers, obviously for small channels it doesn't amount to much, but if you have a friend who's in youtube it can definitely help you take off. Try doing videos with other youtubers or social media people, you can get alot of traffic that way. Bigger youtubers with millions of subs collaborating together can generate so much for both of them.
Fifth, the least pleasant option, is simply Time. If you've been putting out videos and whatnot for months and are still getting under 30-40 views then at that point it might be a problem, but for someone who just started I think you're doing better than most, certainly are doing better than me. Time is the best way to ensure you get noticed, time alone won't get you big but if you're pushing out consistent and quality videos for long periods of time, eventually you're going to grow. It will take more than just that(usually) to get "big big" but opportunities are likely to present themselves as you grow
Extras: Of course if you can get big/popular advertisement that can definitely help, I know some youtubers used to have their channels advertised in the 15-30s ads before videos, some people get shoutouts from already big youtubers, some of them win competitions, some have videos go Viral, and some people simply follow the major trends. My channels just started, like yours, but honestly you're doing arguably better than me so far, if anything I should be asking you for a review. Once you get to a certain point(have been putting out videos for a while, start to catch attention, etc) eventually growth just picks up. Proper advertising(if possible) definitely helps, but at a certain point your channel starts to grow itself without you having to do anything else other than keep putting out videos. For example Markiplier grows thousands of subscribers overnight while he sleeps, because he's got enough setup by that point that he's good to go.
