I took a look at your channel and from what I can see you're current content isn't doing that great and to be honest I am not sure how you qualified for monetization when you've only been uploading for about 3 months and barely average 50 views per video. And that doesn't explain the 3.5k subs you have either. Unless you already started privatizing videos and I just can't see any previous ones that helped you reach monetization and 3.5k subs.
Whatever the case these videos are not helping in any way and your new genre is completely different so I would say go ahead and privatize your content. Just be aware that it could affect your subs depending on why they subscribed in the first place and your monetization status as YouTube will see these videos as privatized and thus not counted as part of the qualification for monetization.