i've thought about adding other levels to other minor skills like panning, farming, and maybe even digging (since we dig a lot!)

it would go like this

farming

• must water plant in x amount of time
• can clear weeds to increase plant growth timer
• instead of buying patches of soil you buy a whole new garden that is only meant for farming
  (so people can actually have furniture outside their house instead of spamming it with patches of soil)'
• there can be different kind of soils that help with certain plants
• higher levels unlocks more plants

Digging

• different shovels get you different things
• can dig relics so you can make more money from digging
• there can be a shop that converts ur rocks (from digging) for items/hats/etc
• higher levels unlock more things
• can dig up minerals that you get from mining
  (must have matching mining level)

Panning

• the higher ur level the higher chance of getting gems
• can get minerals that you get from mining
• different pans get better stuff

but again these are just ideas and its easier said than done!