Why not mining and felling do sth like it?
Mining: 0.1% chance (or same chance with item fishing drop) to mine a moon stone.
Moon stone maybe can be used to craft future items 1000+ lvl like moon plate

for future quests etc.
And a moon stone will be able to sell it in ANY shop. In same price of 10mil (or depends on the chance to mine it)
Felling: 0.1 (or same chance with item fishing drop) to find (maybe) an eastern egg into a wood idk lol. (maybe can chance be increased 1% when we have easter)
Eastern eggs maybe act like a event system. There will be someone in spawn map who will taking eastern eggs and give random items from lvls 0-max
OR
He will have kinda of shop:
(examples)
1 easter egg: 5 mils
5 easter eggs: blitz boots
10 easter eggs: pharaoh plate
15 easter eggs: 250 robe
20 easter eggs: 500 helmet
30 easter eggs: 10 levels
(this feauter can also be only opened event in eastern. as event. instead of anything else like party or portal)
OR quests...
.
Just ideas.