I'm confused why you're asking for feedback. You already chose Svelte and Sveltekit, no?
Here's my feedback anyway: I like Python and dislike Javascript. Yes, Python is slow (though that can be offset via Pandas, among other libs) but it's relatively painless. Unlike JS, which is quite painful to work with. JS libs also come and go every few years, whereas Python's seems a bit more stable in that regard.
But it also depends on whether I'm part of your target audience - who is your target audience?