Can’t leave the house? Order cash delivery! Some services like Postmates or DoorDash are experimenting with delivering cash (in some cities). More realistically, use an app like Bread Financial or Earnin to get a small advance deposited to your bank account, then grab cash at a partner ATM later.
You can also ask a neighbor nicely: “Hey, can I Venmo you $10 for that pizza money you lent me in 2019?” It’s not elegant, but it’s cash.