There is no mana but you can only upvote one person maximum of 3 times a day.
About posting:
You can publish 3 blog posts a day.
About comments - I don't think there is a limit. You can comment unlimited times but make sure those comments are thoughtful.

If you have more - you will definitely earn faster.

I converted 0.29 Ethereum ~ 64$ to 14000 1UP tokens and leveled up to level 17th instantly = 1 vote is 2.6 1UPs. Now I'm already level 18 :)

You can check the leveling up chart here

It takes only 3324 to get to level 11 and earn 2 tokens per vote. It's about 21$ right now and if you look at 1UP on Coinmarketcap - it's growing!