Follow the artists you like on twitter, pixiv, etc. Like and retweet their posts, not some *booru bot.
If you're able to, and you really like their work, support them through whatever means they have available - patreon, fanbox, etc.
That may be what I think is the most fair and appropriate response, but that covers only that specific artist. It's not fair to all the other artists that don't go through the DMCA process