Emergency suggestion, I hope they are all taken into account

Anti-Cheat/Anti-Bot System: Implement strong measures to prevent hacks and bots, ensuring a clean economy.

Nostalgic Low Rate (1x-3x): Focused on the original experience where each level feels like an achievement. Attracts players seeking the pure "Old School" experience.

Unique Bosses: Modify existing bosses (like Zakum or Horntail) to require different team mechanics, or introduce bosses from later versions adapted to v83.

Class Balancing: Adjust abilities of less popular classes (like Shadowers or Bowmasters) to make them competitive in damage and utility. Unique Maps and Bosses: Implement areas from more recent versions adapted to v83 mechanics.

"Rebirth" systems: Upon reaching the maximum level, the player can reset their level in exchange for permanent stat points or special abilities, and given the current rates in MiramMs, this is the most suitable system in my opinion. Of course, I hope my suggestions are taken into account.