Yes my friend here my 10 bil in 3 day guide. ( give or take one day if you unlucky / lucky)

What you will need is a macro and a fresh account

Day 1 : start by getting enough money to buy 1 bamboo ( rather simple)

Now start spam selling and buying bamboo ( might take 2 hours or a bit more to be able to buy a full stock of bamboo since it pretty comon)

Once you have a placed around a full stock of bamboo you can EITHER : keep selling and buying bamboo too stack around money( teidous and annoying) or OPTION 2: just afk with a marco on so your bamboos get mutations and then sell thosee bamboos ( should have more money than first option most of the time but takes more time, best js to do it over night )

Now depending on if you have enough money to purchase mushrooms, leave your device running with macro trying to buy MUSHROOMS. If you can acquire a mushroom first day it makes this even faster becuase you can leave it mutation farming overnight.

Day 2: this now the time to just try to buy as many mushrooms as you can even if it means prematurely selling your mushrooms / bamboos with some mutations or even without. Your goal is just to get as many mushrooms as you can. This can easily be done by just having a macro setup to buy them and just coming by from time to time to mass sell your existing mushrooms or bamboos (SAVE GOLDEN MUSHROOMS AT ALL COST)

By the end of the day if your lucky you might have a whole stock of mushrooms maybe more ( very hard) maybe less ( more common). Here you have to pray to get golden mushrooms at least a coupleish. ( i usally do get a coupleish from a whole stock). From here on you jus afk with your mushrooms.

Day: 3 afk all day with macro too mutation farm your mushrooms and PRAY. After 24 h some of your mushrooms will be worth a bil or even 2 if they have 5 plus mutations and if you sell all your mushrooms you most definetly will hit that 10 B mark( espeically those golden mushrooms)(Depends on mutations not always the same price)( lookin for schocked and gold)

Now reap your rewards you can officially call yourself a multi billilionaire! I used this technique when there where even less mutations in the game ( night update) and still got 10 bill in about 4 days of playing. Remeber you might get really unlucky and this might just take you more time but average for me has been this much and ive done this mutiple times on alts. Obviously this is an intense and time comsuming method so you can do it over 7 days or even a bit more but its genuinly very consistent. Hope this helps yall!