I've... Been working for a year and I only have 85 subs, 5 of which came today because I streamed and got raided.
Seriously, you're growth is fine. The biggest thing with YouTube is patience and not getting caught up in the numbers. If you're constantly worrying about your numbers, you're gonna get burnt out and give up. If you worry about putting out good content and loving what you do, then the subs will come. Trust me, I've been in that place a few times where I look at my numbers and just get down in the dumps. It happens, but you have to make sure you find new motivation to push on. For me, it's always been a nice way to go look up ways to improve more and then that would get me more pumped up to do more YouTube cause I want to succeed, it's just not my first priority.
I see that a lot of your videos get low views (20-30) but then you have a few videos that got over a thousand. Look at those videos that got the 1k+ views, and try to emulate that same structure into your future videos. Video content will get you further along than anything else, because it's the content that people share with their friends, not the thumbnails or anything else.
As for your thumbnails though, they're kind of cluttered. Look up examples of other thumbnails of videos in your same niche, and base your thumbnails off of those. I don't know anything about your niche, but maybe what you're doing is exactly what works for it. If that's the case, keep doing that. But, in my opinion, your thumbnails seem a little crazy. (Don't write me off based on my thumbnails, I know what looks good but I'm just not skilled enough with GIMP yet to produce really quality images) Make sure you do research, it'll help you more than anything else really.
I won't judge on your videos themselves because I don't know your topic at all. You do kid videos and I don't watch those types of videos so I can't properly say what people looking for those videos would look for.