Bring users to this languages and create a big community.
Yes, but how to do this? Making a language popular and bringing users to this language are exactly the same thing, so...
You need a good forum, tutorials and a good support (can be a community, IRC, Mail...)... Collect many good tutorials, port the languages to many Systems, a good documentation, developers to contact for questions. Make articles for free dev-newspapers...
That's the theory and it should work, but not necessarily does. Bacon is a BASIC dialect that has the best documentation and a great support. It's being developed a very professional way. And it's not very popular. It's Unix only, but there are many more popular BASICs for Linux. Some of them are good (FreeBasic, Gambas) others are outdated and obsolete (Yabasic, bwBasic).
And Aurel is absolutely right - the most important thing is to try as many languages as you can and chose those that suit you best. Hobbyists don't have to care that much about languages popularity. They can use what they like. Programming languages don't disappear in a week or month. So even if you choose a language that is getting less popular, it's gonna stay in programming world for a while.