How can I renew my visa in Thailand economically and what are the current options for border runs?

Bon Gia

Do the covid extension for now, then you will have to see exactly what is happening closer to the expiry date of that.

1) you can not do visa run as borders are closed ..

At this point you do. Have to do 7 days quarantine either Phuket sandbox or BKK/ Pattaya .

The extension is easy to do .its the same as doing your 30 day extension but with an extra form .

>1) Which neighboring country are open without the need for quarantine in ASQ hotel?

None. NO bordering countries are currently open for tourism.

>How many days do I have to stay in the neighboring country before I can return to Thailand and receive a new stamp?

If a country re-opens, you can enter the foreign country and return the same day. This is called "border bouncing". Remeber, you get a 90 day stamp on entry

>I am fully vaccinated against covid-19, do I need to quarantine in ASQ hotel again when I return?

We don't know.

>Do I need to hire a specialized office to have the 2 month extension or can I do it myself? How to proceed? I live in Samut Prakan.

That's the worse immigration office you can use for a 60 day extension of stay based on unable to travel due to COVID-19. The last day you can apply is November 26, 2021