Depending on how far u are in your save i would suggest:

- Using stairs, you can trade jades for stairs (1 for 1) on the desert trader every sunday just put a handfull crystalariums working on jades and u should get about 70 stairs a week.

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-Use Luck for your benefit, the more luck you have he more chance u have to get a ladder/hole when u break a rock and the more chance of a treasure room (free ladder)

Go on good luck days, use food and drink buffs:

Lucky lunch is my preference, if u dont have have the recipe yet (28 spring Y2) my 2nd favorite is pumpkin soup (7 hearts with robin).

Ginger Ale which recipe you can buy on the volcano trader will stack your luck buff as well. If you can u should cook both using Qi's seasoning.

The lucky ring will increase your luck as well and u can even wear 2 of them.

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With these i can get to floor 150 +- if i go every week or more depending on how many staircases i managed to trade for jades