Ironigally it seems the font I've been using latley is the same font Fortnight or FallGuys uses. It's slightly cartoony, but I'm always experimenting with font choices. Generally I like a medium condensed font. It seems these days a lot of people are using the same font Nick Nimmin uses, and more and more are using the font I use (good taste folks) but I think I'll be adapting my font branding again soon. I can't remember off the top of my head what I'm using, but I'm experimenting between bold and slightly cartoony, or a gritty grainy organic font that looks like pencil marks or paint/ink strokes.
I'm trying to move away from text where I can now however.
I tend to try and do something bold but eye catching, I use canva too and I mess around with a lot to make sure I get a good thumbnail. I usually do different ones for different videos. I'll sometimes ask a friend to see how they feel about the font and colors as well! Hope this helps
I like the Permanent Marker font that comes with the free version of Tubebuddy, but if I'm making my thumbnails outside of Tubebuddy, like maybe in Pint, I have access to all the fonts on my computer, and I have lots of them. The fancy one I use on my channel banner is called Bleeding Cowboy.
Fonts and text are really eye-catching and it depends on your content and the way you want to present it. It always takes me so much time to decide which one to choose but I think now I have developed an idea of how to use it. They basically express the type of content.