In my opinion I insert my link on every 16K likes that I found and of course it should be base on the video that related to your video. Like promoting your own business. Sometimes it comes to alluring them that's quite hard. Sort of like, Hey there I made a beautiful video about the....please check it out. In other example is like your video is about Olivia and then I went to the comment section with 1K and 5K and sometimes social media, discord, amino is the best to share and get more views.