In the end, you have to decide what type of content you are comfortable with to work on and share on Patreon.
Some artists who run a patreon page don't actually update all too often, yet people are still pledging. Often these are people who already have a fanbase cause they have released a story or game before and fans want to support them.
Some authors might write short prompts about their characters, scenarios that don't happen in the story itself. Others might write origin/backstory shorts or additional pieces about the lore of the setting you don't learn about in the story itself.
Then there are those who mostly update on the art progress, with some info about the characters as they go.
You can write about what lead to developing Azimuth Gap, the inspiration, the difficulties, the research. You may not be able to write about progress on the script, but you can perhaps take a look at different aspects of the sci-fi setting you built and expand on them.
Authors who run a tumblr blog usually get asks about different scenarios or simple questions about the characters, how would they act, what do they think. You could think about accepting asks like this somehow on Patreon and answering them parts publicly and in parts just for patrons.
As you are just starting out, it might be worth considering to not actually put up that many tiers. A basic tier and maybe one extra tier that gets some additional lore info depending on the content you decide to upload. I don't know how many people are aware of it, but patrons can manually increase their pledges as well if they wish to give you more for a time.
I think it's better to not force rewards out of yourself but find out what kind of content you like to do and *can* do on a regular basis. The origin/lore infos I mentioned before are often locked behind higher pledging tiers and not just available on the basic $1 tier.
Personally, I sub (for a time or for a longer time, it depends) on Patreons because I like the games/authors/devs and want to support them. But then I ofen forget about checking out the content they put out on Patreon. I'm probably in a sort of minority with this.