Have an idea. Decided to create a Landing page. What's next?

Hi Indies! I am a developer. I have had this idea for a while, It's an API SaaS for developers (in the same way filestack.com is).

Already defined the scope for the MVP. I have been tempted to throw lines of code, but I have abstained. I want to test the market first =)

Two days ago I decided to create a landing page. I just (kinda) finished it today, but I'm a bit clueless/stumped on what to do next.

I have a rough idea in my mind, but I am unsure if it's the best path:

• Publishing the landing in a domain (duh!)
• Get feedback of the LP from Indiehackers...
• Make noise in Reddit, Producthunt, forums, chats, twitter, family & friends, etc...
  • Or is it too early?
• Wait for first subscribers, and in the meantime code a PoC?

Any advice would be appreciated :)

p.s.: This is the very first time I convert an idea into an LP experiment, I'm a n00b

Cheers!