You're doing incredible!
Some quick analysis I think your successful videos performed well because they appealed to a wider audience who enjoys the series. FNAF fans get to engage with the series more and encourages discussions which is much more appealing compared to your 2 most recent uploads for example.
They are less appealing to a wider audience, and more designed for your subscribers/core audience. You'll get encouraging comments, but less likely from new viewers.
Another big thing is that you're changing the content a little too much. You teir list/discussion videos are doing well, but then your newest uploads are a let's play, and after that a montage edit? You're confusing the algorithm a little and it's struggling to know what audience to push it out to. It's good you're keeping it within fnaf, but if you specialize a little more and try doing more discussion videos I think you'll do a little better.
However, it's not always about numbers. I thought I'd answer your question directly first before sharing my personal recommendation, but just keep going as you are honestly. If you want to make more montage edits cuz you think they're cool, full send it! Forget about performance. Sometimes you just got to explore and you'll be surprised where you might end up! Montage edits especially challenge your growth a lot as a creator and are the healthiest content to make imo, but they perform the worst on average for everybody no matter how well done they are. Pace yourself my friend, you're doing a lot better than most people imo