Are there any jobs on this forum other than being an escrow agent, in a signature campaign, manager of a signature campaign or having your own business?

There are a ton of freelancer businesses, and it is fairly easy to find someone willing to buy/use your services as long as you make yourself look valuable and give them a reason to hire you. There is a lot of competition, but there is work and you can do stuff like that.
You could also trade altcoins with people on here with coins you "acquired" from somewhere, if that's something that interests you.
Basically everything on this forum has a relatively low barrier to entry, and as such anything that takes time or trust will be some of the more lucrative projects.