Growing my business is overwhelming

Hey everyone, I thought I could write here something about my experience while trying to build my business and get your feedback.

Just to give you an idea about what I do, I'm trying to build a web development agency with a focus on building the right things (following the lean method).
I started as a solo freelancer full-stack developer, working for a couple of clients that I helped creating the full-projects from scratch. Working for a couple of clients only felt a bit risky, what if the projects stopped? So I thought to start building a team and a business that could scale more and provide constant revenue.

So as I got more work, I started looking for some help on Upwork and I started a really productive collaboration with 3 developers, that now help me working on the agency's projects. Meanwhile, I'm working on a business strategy, so trying to create an effective website, creating content, studying a bit of copywriting, and Google Ads. But I also need to do some programming, project management, team management, and looking for more clients in a more traditional way (Upwork, networking). Just to make things more challenging, I keep reading books about the lean method, software engineering, etc... because I want to provide a quality service.

As you can imagine, that's a lot of mental work. I'm trying to delegate as much as I can, but I have a budget limit, so I need to do lots of things by myself. I find myself sitting on a chair completely paralyzed because I don't know where to start, what to prioritize (everything seems important) and I feel a great urgency to procrastinate and sometimes give up. But I'm quite a patient person.

My energy is being drained by this. I want to create a business that fits my lifestyle, and not the opposite, but at this pace, I'll end up just burning out.

Did this happen to any of you? Or are you having a similar situation? Any tips to overcome this?

Thank you for reading so far!