If you post a copy of your docker-compose.yml file inside a code block, somebody can probably identify the syntax error for you. Otherwise, the best I can do is tell you you can paste your YAML into https://www.yamllint.com/ and it will tell you if your YAML is valid or not.

While I can understand a desire to try to make money off of running a Mastodon instance – consider that you can host your own private Mastodon instance for about $5/month, which gives you effectively unlimited control and customization.

If you intend to charge $5/month or more for cosmetics, what additional incentive would users have to use your server instead of their own? If you charge less than that, are you sure you’d be making enough money to cover the extra maintenance and responsibility you’re taking on for it?

For one, I’ve found following Feditips to be very useful; they give a lot of good advice on how to use the Fediverse and find other people. They are a bit Mastodon-specific – which is fine if you’re actually using Mastodon, of course – but a lot of their advice applies to other Fediverse instances like Firefish or Akkoma, too.

The general advice I’d give is:

• Use hashtags! Put hashtags in any post you want other people to be able to find, and find out what hashtags are popular for whatever kind of content you like, then search for them regularly.
• Many people start by making an account on mastodon.social first because they’re the largest instance, but it’s easier to find people with similar interests if you join an instance focused around that; then, you can look at the local timeline to find people talking about things you like.
• If you know a lot of people on Twitter, you can use Fedifinder to try to find any of them who have Fediverse accounts.

If I’m on a server and I post something and someone (who is from other server) comments on my post does rules of server where I am apply to that comment?

This kind of depeneds on the admins & moderators of the servers in question. Some servers are very strict and will defederate from other servers that break their rules (mastodon.art is notorious for this); other servers are more lax and will turn a blind eye as long as there aren’t egregious violations.

Is it easy to change servers if I will have to?

Yes, migrating accounts between servers is a standard part of ActivityPub, and it’s easy to move your followed accounts and followers to a new instance, and your old account will automatically forward people to your new one. The catch is that Mastodon doesn’t support migrating posts, so your old posts will still only exist on your old account. It’s worth noting that Firefish, a Fediverse platform that can communicate with but is different from Mastodon, does support importing posts from Mastodon servers when migrating.

Most of the big Fediverse servers are pretty LGBTQ-friendly and left-leaning, and overt LGBTQphobia and harassment tend to get banned quickly. You can view a list of categorized servers that are open to new registrations here: https://joinmastodon.org/servers

If you’re not already dedicated specifically to Mastodon, also check out Firefish servers here: https://joinfirefish.org/join

I’ll just suggest that I would probably not recommend joining mastodon.social. It’s by far the largest server, and as a result is having some performance issues; it also has somewhat more lax rules than most servers, and they can get away with it purely because they’re the largest server, so you’ll probably find a more welcoming community on a smaller one. Maybe tech.lgbt or lgbtqia.space? Also maybe pawb.fun or stop.voring.me if you like furries.