I never thought this would be an issue but here we are... (read caption)

So i havent played this game properly for like 1-2 months and it is REALLY affecting my performance so i would like to ask yall to suggest me some levels/demons to gain back my skill back. Also i have 6k stars and 71 easy demons 17 medium demons and 6 hard demons

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Tl;dr give me some levels/demons to recover my skill