Of course you sell CD's where you play. No brainer, right? But don't forget you might have a fan that sells T-shirts who would buy a dozen CD's for his shop. Somebody like that probably exists in every town you work. The venue too, if you don't already ask them. Give away merchandise and CD's to local radio, TV and media outlets.
Be vigilant, always promote. Don't care to promote? Find someone who will do it for you.
As you build name recognition by performing and selling CD's, your download stores and streaming audio sales will improve. When your next CD drops, fans will have instant access to your new music online. You get the word out from your websites' newsletter, and press releases. Build a network of online information sources that are happy to pass on your new CD release information. You should be creating at least two new CD's a year. Don't have time to go into the studio? Then do a live performance of new material for the next project. Besides, you have to make time to create new material.
If you slow down putting new music into the pipeline, the cash flow and recognition stops. The market has a short memory, and the market is fickle. Whatever the circumstances, when The Allman Bros, Little Feat, Cream, and the Meat Puppets stopped dropping product, the revenue stream virtually stopped and their fans found other bands to follow. The huge promotional tool these days is YouTube. The sales and promotional power of a YouTube Video can be staggering.
With a YouTube fanbase, you can book larger venues, sell even more CD's and merchandise. It's a snowball effect. Here's a band that made this method work out big:
Green Day was playing funky bars in 1995, Check out their bookings, fanbase, what they are selling today: HERE.
If you don't Tour
You can sell your music online and make as much as a touring band.
First, get your music out to every download store worldwide. and on digital streaming venues like Spotify.
Get your music on the streaming audio channels, be sure you know how to collect your royalties. If you don't ask for them they take the money and put it in a pool and the majors divide it up. I'm speaking of Spotify, Pandora,and many others.
Consider an expert label service to market your music online for the best chance to improve your download sales and get an advantage over your competitors.