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Unfortunately you cannot do a COS = change of status when you use ESTA. the VWP law is very clear on that prohibition for any reason.
If you had applied for a visa to enter the US on a B1 for the purpose of looking for a suitable investment you could have filed the I-129 and requested a change of status to E2 because you entered with a visa.
The E visa is different from all other work visas, such as the H, L, O, P which allow you to file a visa petition in the US and if it is approved you can simply use the USCIS approval for visa stamping.
With the E visa the Dept of State has complete autonomy in adjudicating a E visa application even if you have an approved I-129 from USCIS.
The Dept of State has special E visa consular officers, generally MBAs, economists or other such business specialized expertise who carefully troll through the special E2 visa application to determine if it meets the substantial investment test, as other factors. They make their own decision on approval or refusal.
So you will need to go back to Peru or UK and file the E visa application there. It can take up to a month for a decision.
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