Different comics are going to be in different places based on if they were featured in some way in a category, or if the genre/art are such that they caught peoples interest faster. There's no specific pace at which one is "doing good" because everyone grows at different paces for a wide variety of reason.
But 800 subs is good by most peoples standards, especially early on! Try to remember that every one of those 800 subs is an individual person that likes what you're doing and is invested enough to sign up to keep track of that. These numbers aren't just statistics, they're people.
Even if you only had a couple subscribers, that wouldn't be a reason to give up. Creators get better by creating. You can't grow or get better if you stop the second you don't see the numbers you want (or think you want).