So I think I remember that the optimum number for a day is something like 20. An upvote uses your Steem power or one of the magical mystery things on here. Every day that grows by a certain percentage so you can replenish somewhat. For example, I am now finding that I am following so many people and liking so much deliciousness that my votes are decreasing. I probably need to take a couple days off, but I probably won't. I just need to be more selective I guess. Anyway. You can always buy Steem to increase your voting power. You can also have all your posts go totally to just Steem for a while. That's an option. Some people also do the 50/50 but then convert some of their SBD to Steem. Hope that makes sense. There's a learning curve here, but you'll get it.