In my opinion there's should be added some kind of potion (energy drinks?) what gives you some energy (+ 15 energy, for 5k or so, in shop/magic shop, max x3 per day for example)
Or some relic item that gives 2-5 more energy per hour.
Or power what give you 1-2 energy back after winning battle.
Or other "something" what can give you more energy.
I thing in-game energy can create a problems for players, who as me likes to play on map 'cause for PvE gameplay player have ~10 mins of fights (on right zones based on lvl if you focus on fights) and later player must wait for hours to get energy full refill.
It's not even a "boring", it's just disappointing.
More energy = more actions = more fun, commitment and more "life in world" of HR.
PS. I know about rebuying energy with Karmas points, but yeah - Karma$