Krahu, if you want to double your channel size, all you will need to do is the following things: diversify your content (more games, maybe some VLOGs from time to time, etc), invest most (if not all) of your Youtube earnings back into your channel (ads, grow social media presence), and most importantly START UPLOADING EVERY DAY AGAIN! Even if you don't want to do a commentary, do something anyway; make sure there is a new video every day for your fans, sometimes even two. If you are going through some shit, use this as an outlet and share it: push through the hour or two it takes to make the video and get it out there. If you start being consistent like you were back a few years ago, you will start to see some real rapid growth again.
Just some friendly advice from a long-time sub (since 2010ish). I'd really appreciate a reply to, so I know this advice was read. Thanks, and hope this helps!