I just recalled an idea that I saw in another game.

There's a gambling NPC which itself isn't new but that guy lets you try your luck for X gold each attempt for, let's say, 10 first attempts in a single day. Then next 10 attempts cost 2X, next 10 3X and so on until the next day when multiplier resets back to X gold per try.

That guy could be selling awakening kits, instant open unlocked crates or some sort of surprise box that have a chance to drop different stuff.