You can't get card drops whilst the computer is off. If you want to turn the computer off then you could use a phone to idle cards instead, you can idle games with idle-daddy on android.

Android phone, IdleDaddy.

see pinned threads

https://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/1290691937722380084/

The only issue I see is that you will likely be blocking card drops by having a specific game running continuously. Idle Master 'plays' all games at once and then it stops them all and plays each for a few seconds with a gap inbetween with no game being played to kind of shake the tree and get the cards to drop.

Steam broke the login page, log in in your browser then find the steam cookies and copy the values to file menu>settings>lock icon bottom left

See: https://psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/1697168437864920721/

Read other threads. IM'E is not working so well these days, you have to get sessionID etc from browser cookies and copy them to menu>settings>clicklock icon.

Or you could try Idle daddy or Archi's Steam Farm instead.

It is roughly 15x faster than ASF though.

See:
psteamcommunity.yuanyoumao.com/groups/idlemastery/discussions/0/133257636766989675/

https://github.com/JonasNilson/idle_master_extended/releases

I'm not sure if login is currently working, Valve break the login page from time to time. If you can't log in Idle-master-extended then you have to log in to steam in a browser, find the steam cookies and copy the values to Idle-master. See pinned threads.

If the game has steam trading cards that show up on your steam badge page then it should work.