I have bought a cs:go key with my main account and i forgot that i have been banned from CS:GO and the bot cannot give me the key. How can i transfer that key to another account? That other account has cs:go

From your main account, select the key and use the transfer option on the task bar. Put in the "Shop Transaction" address of your other shop there (the 40-char string). For example, if you would transfer the key to my shop, you would put in "b17382324e2fe85cec122af8c6aaee832cd8686a" in the field.