Check out @horpey’s guide on setting up an RSS feed to Twitter automation in IFTTT. https://steemit.com/steem/@horpey/share-steem-post-to-twitter-with-hashtags-automatically-for-good-steem-impression-on-twitter
then every one of your posts and resteems will get blasted out to the Twitter-verse with all the hash tags you can want, including #steem.