A couple of ideas.

dev feedback/notes for future ideas:

investing in the merchant/herbalist - 50k, 100k, 150k for new items, designs, furniture, paint schemes or for the herbalist to make your potions if you ceebs

map expansion - this can be related to the frog charming point below

more animals and their paddocks, cows to give milk, pigs to give random mushies

exterior upgrades

more furniture - couches

tavern expansion/upgrades

frog charming or a dragon to be your travel guide and you can open a 2nd tavern

more recipes (pancakes, custard tart, cheesecake, ice cream/sorbet, yoghurt, cheese, cheesy omelet, surf n turf)

more mini bosses (spawning when you kill a number of enemies, like the voodoo doll summons the scarecrow, items can summon them):-

necromancer - controls zombies that invade your tavern until you kill it

orc chieftain - summoned when you release a number of hostages

queen spider - summoned when you kill a number of spitting spiders

hornet queen - find a royal jelly (dropped RNG on enemy bodies) to summon

king boar - boar tusk dropped RNG

mama bear - teddy bear left in the room (like the voodoo doll), bring to doorway ruins to summon

alpha wolf - summoned after a number of teeth collected