Beg or panhandle.
When all else fails, you always have the option of simply asking for money. If you do this, you’ll probably want to do it on a busy street or some other safe public place that receives plenty of pedestrian or car traffic. You might actually be able to make a decent living by panhandling, although it will require many hours of your time in potentially unfavorable weather conditions.
If you’re going to panhandle, your image is everything. You should look like you are in need so that people will want to help you, but you should not look dangerous or threatening in any way.
You might be more successful if you can entertain passersby by playing an instrument, singing, performing magic tricks, or putting on a performance in some other way, but you should be aware that money earned in this manner is taxable by the US government, while money earned by begging is not.