Reddit is not for you to promote your stuff. So, coming at it from a perspective of "I want to use reddit to promote my stuff" is fundamentally flawed.
Reddit is a collection of communities. Each subreddit is a community focused on a particular topic (whether it be a specific video game, video games in general, accounting, engineering, small objects, big objects, funny things, memes, jokes -- if you can think of something, there is probably some subreddit around it.) Redditors ultimately want to see good content relating to their topics of choice (that is, what is relevant to the subreddit).
As a redditor, you should be seeking to post good stuff that is relevant to the particular subreddit's interest.
You ask, "If you get banned for posting your own stuff, then what are you supposed to post?" Well, there's more stuff on the internet than just your stuff! You're supposed to post stuff from a wide variety of sources. Most subreddits follow an informal "90/10" rule...no more than 10% of your posts should be from a particular source. In this case, no more than 10% of your posts should be self-promotion from your channel. You should be active enough posting about other things and other content that that other stuff should be 90% of your posts.
If this does not sound fun to you, then reddit is not for you. That's OK. Some people only want to promote their stuff, but reddit is not for that. Reddit is for if you want to be active and engaged with communities, sharing things that are of interest to those communities. If some of your youtube videos *happen* to be of interest to a particular community, that's great, but you should be actively sharing other content, or else you're going to have a bad time.