Saying, “we need to” is about as noncommittal as not saying anything at all. That’s like my girlfriend pointing out that the kitchen is a mess and me saying “yeah we really need to do the dishes”.
She has no control over it, the only thing she can do is what Biden did, ask them to investigate it and reschedule it. The executive branch does not make laws. That's on the Senate/Congress. The number of people arrested for marijuana by the federal government isn't the number of people in prison/jail for it. They are/and will be arrested by states. A law must be written to superseed state laws on marijuana... As the president cannot pardon people from state laws.
Vote for new senators/Congress members... The only 1 the president puts in place is the Vice President in the Senate.