That depends on a few different things. Do you find your content valuable? Do you feel the need to reward yourself for doing something? Do you expect a certain return on your stake weighted investment to the platform (if you made any investment)? If the answer to any of these are yes, then you may want to upvote your own post.
Many of us tend to not upvote our own content and use our voting power to reward others. That's strictly a personal preference and by no means a rule or mandatory thing. I didn't vote any of my own content for most of the last year and just trusted others to vote on my content if they felt it or I added value to the platform, but recently I started following a trail to help decentralize the chain more than I was before. If the trail votes on me then I end up voting on myself anyway because I follow that trail.
Ultimately it's just up to you to decide what you want to do with your own vote and whether or not you want to reward other users or yourself.