Can I convert my visa amnesty or visa exemption to a Non-B or tourist visa while in Thailand?

A very reliable source of mine told me that the visa amnesty meaning is you got until july 31st to leave. There are flights out of thailand. Dont wait until july 31 to sort your affairs and surely dont think u can just hop over the border and back that wont happen in a while.

In both cases, no. You'd normally have to leave the country to get either, but who knows at the present time what will happen after 31 July?

If you have been offered a job, shouldnt they assist you in taking care of your visa? Companies have to do some paperwork for you to be able to get a non b, but I heard it is pretty difficult now because of the pandemic and Thailand strict guidelines at the moment (looking like the near future will be strict as well so if u get out it will be hard to come back in unless you are prioritized). You could circumvent and try to get a visa through a language school but you will have to attend classes. Either that or get a volunteer visa. This is only my perspective and experience.

Can you go from the visa amnesty to an in country 90 day Non-B visa (doubtful :( ) and if I had to guess I'd say nope you can't do that either

That's because to apply for any in country Non-Immigrant Type visa you need "real days" left on your stamp in the passport and this amnesty is a 'no stamp' sort of thing, <- meaning it looks like you're on overstay because you're here on a stamp that has expired (BUT you're on the amnesty).

All you can do is ask your employer IF they can go from the amnesty to a 90 day Non-B visa inside the country and if they can't you wait on the amnesty until the borders, nearby countries and thai consulates in those countries open back up and then go get a 90 day Non-B visa at one of them..

Can you go from the free amnesty to to a tourist visa NO

You BUY a tourist visa to thailand at a thai consulate in another country, you can't get them IN thailand