Hi @yukyo 
Sorry to hear you’re having trouble with this!
While we can’t really help with publishing your custom image, we can definitely try to guide you in the right direction 
For starters, you might want to take a peek at this post from @MutedJam:
It would give you the simplist possible “Hello World” custom n8n image using the hello-world-npm module that you can use to test and build up from. From there, you can use it as a guideline to install other packages 
The only part left from there would be making it available on AWS. This guide is not n8n specific, but it’s a pretty great guide to cover that part.
Of course, I’m not so sure how up to date that guide is, so you may need to check in with AWS on deployment if it’s no longer accurate. But this process shouldn’t take eight hours either 
If all of this doesn’t help, it may be best to stick with DigitalOcean + Hetzner, as it’s what you know 