: If you don't have any clients yet, you may need a certificate of employment or employment contract (your own business). At the end of the day, the Embassy must be convinced that you are a freelancer/ remote worker/ digital nomad.
I can answer only your first Question. Thai Embassies in countries neighbouring Thai are not using evisa system. Malaysia is starting to adopt evisa in October, according to their website. Currently, only Vientiane, Jakarta and Phnom Penh are open to DTV application, according to their website. Please email the other Embassies to enquire.