Today I found the website steemfollower.com where you can upvote the posts of other steemians and get upvotes back for your recent post from other steemians, that like this post. The worth of the upvotes you got back is up to 5x the worth of the upvotes you gave to others.
Here is a screenshot from the user interface of this site.
I'll test it for a while, and tell you if it's really worth it.
If you also want to try out this service, then please use the following Referral Link:
https://steemfollower.com/?r=343
This site uses steemconnect to login. So you only need your steemit username and your posting key.