When does YouTube start showing a video in related videos and recommendations?

Question

YouTube

When does YouTube start showing videos in the "Related Videos" and "Recommendations" sections? I had many channels, somewhere more, and somewhere less views, usually it was in the region of 0-5, but some reached 100 views in long months. The quality of the videos, SEO optimization, etc. were on the level, the current topics of LF, MF, HF requests, everything was designed as it should be, it was relevant, somewhere better than that of competitors, but there was never a single impression on any channel in analytics and especially viewing from the section related videos and recommendations. What can be wrong? When do videos usually start showing there? all my traffic on videos is 100% search, that's it, my videos are only found through search, I don't understand how to make them recommended. There were a lot of channels and videos, just normal, where for 5-6 months I shot at the beginning every day, then 2 times a week. One of the channels led for several months and there were several videos every day and the result was the same, 0 impressions in the recommendation and similar videos. Help me with advice please