I don't play a lot of Minecraft, but I've seen plenty of people on here who do. You can always find someone to collab with, even if they just hop in your world and you two just run around building stuff. You might stumble upon a fun idea, that's how some of the best ideas happen in my opinion.
Quick note. Take it from someone who learned the hard way. Don't make Minecraft and Cod videos just because they are the popular games or thats what the people want. I did the same when I first started uploading with call of duty. I soon learned 1. I don't enjoy playing all that much, and 2. Your videos just get bogged down under all of the larger channels videos.
If you like playing Minecraft and Cod, continue to do so. It may be a bit harder, but people do notice when you enjoy doing something and the subs will come. If you are just uploading because you think its what people want, your videos are not going to be as good. Sorry about the rant, I'd rather not have someone else start to dislike what they do like I'd did for a time if it can be avoided.