Hey Rawad, I’m happy you found a rate that works for you. If you’ll take my humble suggestion, after you complete your first project, bid your next one at $40/hour and see if it works. From my experience, you’re well below market rates at $20/hour.
$20/hour will (roughly) equate to $20,000/year, or $1,700/month – unless you work above average hours.
If that amount will make you happy, awesome – keep at it. If not, try upping your rate to see what happens!