Nice to have you in the Community space, @n-molotkov-growi.
The option to change the currency of your QuickBooks Self-Employed (QBSE) account is currently not available. As a way around, you'll want to manually convert the currency and enter it in your account.
In addition to Fiat Lux - ASIA, you'll want to sign up for QuickBooks Online (QBO) Essential, Plus, and Advanced to avail of this feature. This way, you can record transactions in foreign currencies.
The great thing is, you can try QBO for free for 30 days. This way, you'll get the feel of how the system works before purchasing it. Once you've created a trial account, feel free to utilize these articles for guidance. These can guide you on how to efficiently use the multicurrency feature and navigate your ways around QBO:
Additionally, I've added this link that serves as your guide in case you need to record an invoice in QBSE: Create invoices in QuickBooks Self-Employed.
I'm always here if you have other queries about currencies or with your QBSE account. Just leave the details in your reply and I'll take care of it for you. Have a good one and keep safe!