I don't play Ark. But the way I get my tags is I type in key words of what my video is about in the YouTube search bar. Say your video is about Infinite Warfare. You type that into the search bar and whatever pops up, if it relates to your video you put it as a tag. also abbreviations work as well. A lot of people instead of typing in infinite warfare they type in IW. so the same tags apply. you can have infinite warfare multiplayer and iw multiplayer. if that makes sense.