CHANNEL 29 subscribers · Other / Unclassified doesn't seem to fit. Since no first name or title is typically associated with a system in the format you provided, let's take "Barton, Brad" apart, in which case the relevant category will be selected based on the last name. In your list of categories, "Barton" can be paired with "Freelancing & Side Hustles",

CHANNEL 13 604 subscribers · Web & Development (specifically "Technology & Programming" category isn't specific enough, but based on the first word "Remylind23" system is implied to be a system related to tech/web development)