Use the social aspect of the game. Group with other people. Either with friends or random people in the same area. Whatever you do, you’ll do much much faster in a group and with more fun. You’ll be amazed how fast you will level. Doing higher level hearts wont be much of a problem either…
But you’ll probably forget about caring what level you are after a while; because what you do in this game at lower levels is not that different than what you do at higher levels. The only difference for me is that there are more dungeon options at level 80. Which I love doing by the way
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Story and the world in this game is amazing; but playing single gets really boring after a while imho.