The workload, I consider that I made a huge mistake when I decided to create one image per phrase. I create around 200 images per month, but users consumes them in just some minutes, and they feel that the update was too short.
I see some Renpy games out there here using one single images, devs put tons of text, alternating with some good animations, users like it, the cost/benefit is definitely much better, but I can't change the pattern until the game is done.
I wish I could have more time to study new tools that I bought like facegen, anisound, anilips... But the monthly workload just make it impossible
That whole design is quite flawed, imho.
Even if you had a team to do all those renders in a reasonable time, should you? Even if you compress your images to hell (which is a bad idea to begin with), once the game gets big, the size will increase to tens of GBs.
I do not know where that idea came from in the western VNs, but when it comes to Japanese VNs, the sprites and background are two separate things for the sake of being able to reuse them throughout the game with no extra costs (Time/Memory), not to mention that you can simply edit the sprites without having to worry about thousand of renders.
Especially when it comes to these type of games, people care mostly about either a good story and/or good sex scenes: You can have a good story without doing a render for every sentence and you can have good sex scenes by investing that much effort and time only on those.
Anyways, enough off-topic, to answer the thread's question:
Just enjoy what you are doing and have some good time with it, this way you'll never burnout.
If you do this as a job or because you want to make money, you are set to burnout eventually (with the latter making you abandon your 0.1 most likely).
Making a game has to be something you have passion for, something that you actively seek to do... Like minimizing a boring episode or hurrying back home in order to do something for your game.
It has to be more like "I am super excited to do this!" rather than "Meh, I guess I need to do this today".
Many people start making these types of games (or games in general) all for the wrong reasons which leads to burning out.
It also depends on one's personality, perhaps you enjoy making games, just different ones.
That is another mistake people do: Making giant projects which will see the end in perhaps... Three years from now? Maybe more?
I love my current project, and I have been doing this for a little over a year now and despite not having a personality which leads me to burning out, there is no way I'd want to keep this project for another year or even more. No way in hell.
TLDR: To avoid burning out, have some good planning beforehand and enjoy what you do as much as you would enjoy reading, watching television or playing a game.