You ask this anonymously, because you know the answer, already, right? 🙄
With the DTV visa (DN path) you are allowed to work for a foreign company and in work fields outside of Thailand. It gives you a permit for remote work only. You are not allowed to work with customers in Thailand.
You can search easily for these questions/replies. Several people tried to extend, but it was more or less a mess, because you need to bring in all the information again. It is just easier to leave the country and return again.