This will probably be the most obvious of all these tips, but here we go.
Buy things made by the artists you love. It doesn’t really matter if you need it, or if you’ll use it, or if you just buy it to give it away. It doesn’t matter that they’ll probably only pocket a dollar out of every ten you spend.
It matters that you’re putting your money where your heart is.
It isn’t the only way to support your artist, of course, but it’s a good place to start.