I do ytp style of videos so I follow/sub to a lot of other ytp-ers. What I tend to see when they haven't uploaded in a while is that they upload filler videos.
A filler video could just be a small clip of something small you made, maybe a sneak peak to coming videos, or you could just do bloopers or outtakes. People tend to like or at least be OK with those type of videos. I would try not to upload a lot of filler videos in a row or something.
Maybe you could start an outtake/blooper series on your channel so you could upload those if you didn't have anything else to upload.
Also I know what you mean by writers block I had it for like a month before I got another awesome idea, but sometimes you just gotta wait, maybe try something new or something.
If you have any questions, feel free to ask.