Por ahora llevo 10 pero y creo que como mínimo tendré que conseguir 50

Don't wait, launch bc you will get feedback that will help you improve the app. Waiting for more people to be interested tells you nothing, failing on a small scale (or really doing well) tells you quite a bit about next steps. Good luck!

muchas gracias lo lanzare lo antes posible, me gustaria que tu fueses tambien uno de mis primeros usuarios, echale un vistazo a uesdash.es por si lo necesitas

This, wait lists are very low info and value, don't wait on your wait list, just start iterating

the hard part will be standing out in an insanely crowded market

Ya, tienes razón pero creo que es posible y que si le dedico esfuerzo y me diferencio sobre todo lo conseguire

HN is english only as a shared language among the community

[I like "shared language" as the explanation of the role of English here. I'm stealing that for my future comments.]

Your list is all channels. Channels are rarely the issue. An unclear target and unclear promise usually is. Pick one role, one painful moment, one outcome your ideal prospect would talk about, then DM 20 people who match that, and ask what they are doing about that problem today. Think of it as learning how they think rather than pitching them. And ask yourself this magic question: "Who is the one propspect whose problem I can solve this week?"

If you can’t think of one, then that’s the real problem. Either you don’t know who your prospects are, or you don’t know what problems you can solve for them.