I'm over 1k subs, trying to keep up with writing blog posts, running a business, personal life, and creating a product hypothesis, etc. Do I still need to post every week?

Writing a weekly blog post, especially after earning 1,000 subscribers is a strong recommendation - but not necessary.

For instance:

We currently have big goals around how we're structuring our product launches this quarter vs. list-growth and content creation. We're aiming for a monthly post instead of weekly to help maintain that focus.

You could do a more simple newsletter for subscribers only and a less-frequent blog-style post to your site.