You are probably under fire from the youtube algorithm for either posting alot of links (to your channel/video for example) or just for spamming similar comments like "check out my channel" "please watch my new video" etc. You said you advertise your channel through comments (which isnt a great idea, try reddit instead) and you are porbably right now something called "shadowbanned". Which means you don´t know/get message if it happens, but right now all your comments need to be approved by the creator, even if they don´t include filtered words.
I had some comments on my channel that had no advertising in it but were still considered spam (aka i, the creator, needs to approve them before they are visible) because these people were shadowbanned.
I don´t know it that just fades away or something. Just start writing non-advertisional comments on smaller channels that will actually bother aproving your comments, so the algorithm will see that your comments get aproved again -> they arent spam.
And then stop stamming. Use reddit, twitter, stumbleupon or other sources of getting you out there, maybe buy some google ads for your channel for 5 bucks, spamming will get you nothing but banning, blocking and dislikes.