If you are an Estonian e-resident, you can apply for a company in Estonia. This is the easiest way to set up a business and it has no residency requirements.  https://www.eestifirma.ee/en/service/company-formation-in-estonia-e-residency/ You can then invoice your customers in Estonia and deduct your expenses from your profits. There are several costs associated with starting a company in Estonia, but the fees are usually much lower than those in many other countries.
The process of setting up a company in Estonia is relatively simple.