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@abt
Unfortunately, it’s definitely harder now to upgrade your characters at higher (>10) levels because it’s harder to earn crystals. You just have to keep playing to earn coins/crystals by doing missions and playing nodes.
For example, you need 81 white (common) crystals to convert to ONE (1) gold (legendary) crystal, so it is definitely not easy.
Here’s a chart I made on the upgrade costs and time to get to level 15:
