Hello there!
Okay, okay! I know I am a gaming channel! Please don't hurt me! Just kidding
About the don't kill me part... I am still a gaming channel... okay let's get into the point xD
Well, for a start you have to make sure that your branding is AWESOME. Top notch, no mistake in that. I know that my own branding might not be top notch, but I think it is pretty good. You should aim for a much more detailed banner with your IG and twitter on it. Why don't you have it there? Com'ah... it helps all your subscribers find your videos on other platforms. For the PP, maybe the text should be a little bigger? I can't say anything else about it really. A rule of thumb over any of your thumbnails, banners or whatever. Text has to be readable. Therefore it has to be quite large. I know that over the laptop or PC it might seem fine, but nowadays a huge part of the Youtube member base use phones, and you really want your font to pop clearly on such small pictures.
Now that was advice on how to grow slightly more quickly, which helps to not quit. Now to the question itself. If you are doing Youtube just in the goal of being famous or having a huge Youtube channel, then do not do it in my opinion. If you think that you will regret doing Youtube if you do not... you know... get famous from it. Then just move on. Anyone's chances are pretty low because you are really competing with millions of other channels. So to put my point in a simple sentence. Do Youtube for fun. That's the biggest motivation.
For how to stay strong. The most important thing is how you think of stuff pretty much. Do not demotivate yourself. Always find stuff to motivate yourself. Either if it is getting a new subscriber, or to make a video you really wanted to do, or to receive such an awesome feedback on one of your videos!
And a quick tip! Add "How to" to the start of your videos when it seems appropriate. Better SEO
Hope that I helped!