1) Change all dungeons to be accessed by 1 player (or more). It can help many players who play alone or those without a team that can't complete the main dungeons in the game.

2) Create a new product in the gold shop:

Gathering Boost - Grants a +33% bonus to collecting gatherable herbs for 30 minutes. Available once every 22 hours. Costing between 3 and 5 noble Zezenian coins. Since we usually collect around 3 herbs per attempt, this bonus will increase it to a maximum of 4 (+1) per turn.

3) Enable Traps (Rogue) and Arrow Volley (Marksman) to be targeted by cursor. Both spells have a high cooldown and are small AoE, so this change can improve their usability in gameplay.

How about bringing botanist gear to the game itself that boosts up gathering levels.
Same could be done with fishing

I agree with all your suggestions. The dungeon ticket is currently quite expensive, and not all players want to do dungeons, this should have been changed a long time ago. Regarding gathering, it would be a great help

That would be sexy

Indeed. Really useful for those spells.