Oh man, Outdoor is one of the best niches on Tiktok right now, how havent you started yet??
About how to "transforming articles to Tiktok videos", just imagine like this: You are a director, your article is the movie script. Now all you have to do is find some actors to make the video.
And by "actors", they dont need to be Leonardo Di Carpio or Jennifer Lawrence. Just find someone who is willing to show their faces in the video. You, your brother, your sister or your friend, etc.
Being an SEO moving to Tiktok is a HUGE advantage because you have a weapon that other creators on these platforms dont have:
the movie script.
Most creators on Tiktok dont have a movie script. That's why you see them doing stupid dances all the time (though I have to admit I enjoy some of them

).
To sum up, moving from SEO to Tiktok is the best thing of my life. There is no competition, no blackhat whitehat, no stupid updates. Just you and your ambition. Tiktok respect you and will give you everything to success !