Why is my channel getting half views of last year?

FoxJones

Member
Joined
Jul 9, 2019
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Age
43
Hi,
I have a channel where I have put many clips of documentaries made by myself.
Last year there were many views with many subscribers as well. Then month after month the views decreased until the middle of last year.
Yet every now and then I revive it by putting clips from new documentaries. I don't have any youtube experience, but I would like to know why this is happening.
My channel is this:
Thanks for some pointers.