How should I spend 4 billion coins

[Straaw_]

I have a lot of investment of skins worth a total of 4.5bil sitting on my island that I'm going to sell 4 bil of to a lowballer that offered to buy it but how should I spend that 4 bil.

I wanna mainly focus dungeons and mining I am grinding for hotm 10 and should be done in two weeks.

Here is my profile.
https://sky.shiiyu.moe/stats/SweetBunStraw/Kiwi

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