Bundles, seasons and an email list

From a few sales a week to a steady $1K a month usually takes three things.

• Bundles: related packs sold together at a better price.
• A season calendar: holidays and party seasons come every year; publish and promote ahead of them.
• An email list: every buyer and every free download joins it, with one useful email a week and a clear unsubscribe.

Keep promotions modest and honest: say what is in the pack, show a real preview, no hype.