There is an annoying troll who keeps harassing me on my videos. Should I change my videos to unlisted with comments turned off or is it better to make it all private?

It depends. Ask yourself these questions: Are your videos something you want open to the public to see? Do they contain anything personal, like people's faces? Would you be embarrassed if someone found the video and showed it to strangers? Unlisted videos are not private. Someone who has the link to your videos can keep it forever and share it to other people. A troll can use it to harass you if they have harmful intentions. It doesn't matter if you have comments turned off; a troll can use another social media site and harass you there. Setting them to private is the safest option, especially if your videos contain personal content. Only approved people can view a private video.