Saddly if you are now well known you may well have to support yourself by other means until such times as your songs are pulling in sufficient income to allow you a choice.
You could diversify into doing music for other purposes, such as corporate music, TV and Film, advertising. Each are has it's competitors and it's idiosyncrasies.
Unfortunately simply living as an artistic being is not seen as a vocation by the public just now. More something we are somehow meant to create in our spare time for the enjoyment of everyone else. Sad but true. To live as close to an full-time artistic life as possible we now need to be business men too. Or as Tom suggested, another means is needed to fund artistic pursuits, ie a job.
Making a living as a musician / songwriter is still very possible, it just needs new tools and know-how, determination, and as few dependances as possible. Oh and a shed load of hard work. And a patient (if hungry) family.
Not knowing where you are based I can't suggest much passed a lot of hard work. Have you ever registered your songs / yourself with professional bodies? Certainly the main stay for Songwriters is income from performance royalties, mechanical royalties (songwriter's share) and synch fees. If you or your songs aren't registered you get no money other than what you sell directly.
In the UK, for example, venues, broadcasters etc pay money to PRS for the right to play music. That money is then divided up between their membership based on extimations.... however if you are registered for PRS and you inform them that you played x number of songs at the venue, then you get paid specific money from that specific venues' fees. Even when they paid you play!
If you have a back catalog, and you are prepared to work it, then homework on anyone and everyone who would be interested in your material, including other artists perorfming a cover, is an absolute must.
I hope some of that gives you some ideas.