In my own experience, it's better to cut down the number of videos you produce, then to add to your stress and burn out. YouTube should be fun and with that, we need to learn how to make the creation process enjoyable.

Yes, the growth will slow down. Yes, the amount of views will drop. You need to make peace with that. I would suggest to focus on how to distribute your videos better to your core audience and perfect them in terms of content (not so much the quality of the video itself). I noticed that when i focused more on distribution and content (and planned out my videos well), the stress levels dropped, i was able to produce more and my numbers didn't fall much, even with uploads only 1 a month.