There are several strategies you can utilize in increasing your upvotes especially and resteems on steemit.  The first and my personal best is joining and being active in communities. There are several platforms built on the steemit platform which rewards users for being active on the platform.

For example, Musing.io is one of such platforms. You ask questions on Musing, as well as answer questions and get a reward for these activities. Hede.io is another of such platform. Give definitions to terms in your culture, tradition and several others, and get an upvote from the team.

These and more are many ways of increasing your upvote on steemit.