My Hero Ranking Isn't Going Up ⋯😢

It's my second day playing Dungeon Quest. My Hero Ranking went from 100th to 80th place. It's a slow pace 😅 I'm not winning easily. It's a cycle of losing → gacha → strengthening → winning → losing → gacha... and I can't seem to progress much 😢 If there's any groundbreaking way to advance, please tell me 🙇♀️