should I delete old videos that are no longer getting views ?

So i have a couple of videos in my channel that have very low views and are no longer getting any. Should I delete them ? they are anime episodes preview and im afraid that if keep them i might get a copy right strike down the future for nothing as im not gettting a dime from them.

The reason why im asking this is that Iam not sure if the number of videos in channel matter concering page rpm. what do you think ?

Instead of removing them better keep them private, Since if you will remove you wont have a uploaded copy so in future you wont be able to use them.
And as per my experience number of videos dont effect the RPM.

just keep them unlisted