Is it possible to enable multi-currency for quick books self-employed? If not if I upgrade will I be able to change this setting?

QBSE and QBO Simple Start doesn't support the multicurrency feature. You can open a Wise account as the workaround and integrate it with QBSE. You can withdraw your different currency earnings directly into your Wise account. This way, you’ll avoid paying high currency conversion fees. Wise account details are compatible with Amazon US, Amazon Europe, Amazon UK and Amazon Australia.

https://wise.prf.hn/l/64dl92k

Otherwise, switch your data from QBSE to QBO Essentials or higher plan to enable the multicurrency feature.

https://quickbooks.grsm.io/US

https://quickbooks.grsm.io/us-promo

I would love to do this but I sell on Amazon Mexico as well. Wise doesn't currently support the Peso :(.