What steps should I take to stay in Thailand after my work permit is canceled and my visa is expiring?

unfortunately (for you)

@Chri*****

the fact that your employer handled all your visa/extension work permit stuff hurt you more than helped you. :/ Because you don't have the slightest idea of how things work or are processed.

Be that as it may.

AND now that you mentioned you're a person who uses Cham Churi Square's One Stop Service Center, you take your work permit and your passport and your termination paperwork there, cancel the work permit, then cancel the extension. Depending on the immigration officer once you cancel your extension they can stamp you for 7 to 21 additional days, BUT once you cancel the extension, and get the other stamp GO to Chaengwattana and apply for the 60 day covid extension BEFORE the 29 of Jan (the day that order allowing them runs out)

okay first off you need to understand the work permit doesn't let you stay here, it lets you WORK here

Also I doubt you're on a Non-B VISA and I think instead you're on an "extension of stay" <- look at the stamp in your passport to see what it says,

Go cancel your work permit, then take that receipt and the documentation from your employer and go cancel your extension of stay, and then immediately apply for a 60 day covid extension