Sadly, channels come and go and the algo kills channels left and right. I have a suspicion it manipulated to show different type of content seasonally and they just tweak it based on the content seasonally. My (not electronics related) channel died as well. How? You can have thousands of subscribers, yet you only get a hundred impressions. The people who subscribed, they are never shown the video thumbnail at all.
It's part of the manipulation of the masses scheme that google is running. General entertainment channels are less likely to have problems, but if you do anything remotely interesting, you are prone to this. And it's not a bug, they for sure do this intentionally.
He does repair, the "Right to repair bill" is a hot topic, google moves the needle, channel gets zero traction.