How do I level up quickly in Felspire?

How do I level up quickly in Felspire? - Brown Wooden Blocks With Number 8

It's difficult for me to level up after I reached level 100. Are there any strategies?

felspire

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How do I level up quickly in Felspire? - Scrabble Tiles on White Surface

How do I level up quickly in Felspire? - White and Red Candy Cane on Pink and White Heart Shaped Paper

How do I level up quickly in Felspire? - Close-Up Photo of a Person Pointing at Start Written on a Paper

Felspire (Wow. Leveling so fast.)

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Brett Jordan, Brett Jordan, Nataliya Vaitkevich, RODNAE Productions