Your vote power builds back up, if you stop upvoting for a while. People tell you not to do that, but how else is it supposed to build?
I opened a busy.org account and occasionally post from there, this gives me a vote power slider, which allows me to control the percentage value of each upvote.

That way I can upvote on a comment, at 0% when I don't feel it worth my trouble, but want to mark it as read, or I can give 50%, or 100% depending, mainly on how much I have left until it builds back up.
If you get a Steem Now account, you can see how much you have and when it will be built up again.