Hi, i'm new here Struggling to Start

Hey everyone,
I'm new here! I've been around the web for about 10 years, exploring different fields and domains. I've learned a lot along the way, but honestly, I've never really started anything seriously. Every time I plan to begin a project, I end up overthinking and worrying that I'll just waste time without seeing any real results.
Right now, I'm a 3D artist. I mostly do it for fun, but I've been trying to find clients with no luck so far. Some friends say I'm actually better than many designers out there, which makes me wonder what I'm missing.

So, I wanted to ask:

How do you actually start and stay consistent with one thing?

How did you find your first clients or opportunities?

Should I focus on building a strong portfolio first or start reaching out right away?

How do you deal with the fear of wasting time or failing?

And finally, are there any domains or online fields that are worth starting in right now or have strong potential for the future?

Any advice or personal experience would mean a lot. Thanks in advance!