Generous people change the world. Not because of what or how much they give, but because they are doers and see possibilities where others don't.
There's a quote I love that says, "If you won't be generous with $10, you won't be generous with $10,000."
If you don't build up the muscle of generosity when it seems you don't have as much financially to give, that habit won't suddenly materialize when you have more.
If you're not used to giving or if it feels intimidating, it's okay. Just remember that nothing changes if nothing changes. Make a commitment to start small. Donate $1 from every sale you make this year, starting today.
Smaller amounts do still make a difference to organizations, but more importantly, the act gets you in the habit of giving and begins to change you into a more generous person.
The phrase "give back" is often used in relation to generosity, but I'd encourage you to adopt a "give as you go" mantra instead. The world needs you and your commitment to an optimism that things can get better, now.