I'm getting fed up with all the rubbish/noisy adverts that YouTube is pushing, and I'm concerned that those are being added to videos without any reward for the ciontent producer. YouTube is constantly pushing an ad free premium service that I need to pay to join. I'm reluctant to do this if all the decent content producers are leaving the platform.
Lots of traffics still hover on youtube, and creators still make money from the platform. Though, the fact that users are moving out doesn't mean an end to the platform, a new set creators like you would join the platform and continue publishing their work. However, if you are in the US you can use Patreon to create contents and earn money, VPN works too, if you don't stay in the USA. You also need to understand that getting traffic will be difficult for those who don't pay for traffic, unless you devise a different method that works for you.
Youtube still harness the highest number of video contents, short and long. It'll be difficult for it to leave its dominant position. New contents platforms are coming up, but the traffic on youtube is still excellent and enormous. Don't know about how they pay, but the topics you listed above are very interesting and catchy. I like the way you made it look attractive and the fact that you'll also create some fun contents that won't focus mainly on bitcoin. It's better to start, be consistent and forget perfection for now!