I find that it is actually rewarding to show my staff appreciation in real time throughout the year rather than just at the holidays. If I can sense an employee is struggling or having a hard day, I do one or more of a few things: Grant them a mental health day; or Venmo them funds with a specific memo such as: "Treat yourself to mani/pedi," "Get DoorDash," or "Take the family out for a meal."
I love celebrating wins: Passing the EA exam, birthdays, and anniversaries. My favorite day to show appreciation is Valentines day, perfectly timed during tax season. I pre-order flowers and chocolate-covered strawberries for my virtual assistant (she LOVES them and hides them from her family), and for my more health-conscious employee, I order a fruit bouquet. I make sure to order using my personal email account so that my employees don't see the surprise coming.
Just like a marriage, showing appreciation is the most important priority for success. When you genuinely show you care, you provide a priceless component to employee retention. But appreciation comes in so many different forms and means different things for different people, so I make it personal, individual, and unique.