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That's one aspect of it yeah, there are other metrics that also influence your UA score, most of them are mentioned in the announcement post

How to increase your own UA score?
To put it simple: by being interesting / "attractive" to others. Either you publish interesting content that people want to read and comment on (like @paulag for example), or you own a lot of Steem / SP that you might want to share with the people you interact with (like @thejohalfiles for example), or you do other noteworthy things with that people might be interested in (you form a community like @dtube, @utopian-io, @steemhunt or publish an app like @steempress for example). Being a Top Witness helps as well! ;-)

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