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At this moment, I will use steemlike. It gives about 130% of profit. Others like randowhale that I tried did not give very good return. The problem with steemlike is that you will have to wait for many hours for the upvote and they also don't give a reply after it upvote. You have to check using https://koinbot.org/#/steem/like and this link also get to see whether are they still giving good upvotes to us. It is not by bidding which does not have a definitely return. Their steemit site ishttps://steemit.com/@steemlike. Please do your own research as my post is just sharing my thoughts so it is not a guarantee that the method will work definitely!