Usual socials plus several fishing forums that I've been a apart of for decades. Aside from that the best promotion for my videos has been making the videos that my people want to see. For me it fishing adventure documentary-type, but that content is hard to make as each adventure is like mounting an expedition or small excursion.
Tutorials, they don't watch much. I can see the difference between the tutorial content and the adventure content. So you have to figure what content works best for your audience then put your greatest promotion efforts into those videos more than the every single video you put out.