It's not wrong to get some inspiration from others. But if you want to start the same thing what others are doing, make sure you are dedicated and passionate enough to do it.
To put it straight, YouTube is bit harder than you think (not to disappoint you, but this is the fact). Why I'm saying is, I own couple of blogs and YT channels. Content preparation for blogs is comparatively easy than YT and moving the YT needle also requires lot of efforts (and time as well). Irrespective of all your efforts, your YT earning during initial days would be peanuts. But If you are targeting for long term, you will have better chances.
My advice would be, if you can deliver good content consistently with some patience, you can definitely give it a try. But choose your niche carefully. Don't choose niche based on RPM, instead choose the niche in which you have expertise and confident enough to deliver.
All the best mate