Try taking little breaks throughout the work day -- even if it's just for refilling your coffee cup or other cup with any other beverage you drink.
If you have the time and can do so take a walk outside especially during your lunch break.
Try to Fill your desk with some things you love.
Make countdowns on a whiteboard for upcoming events and update them daily.
Add a couple plants to your desk. Small succulents are best. I don't know what it is, but that tiny bit of life helps so much.
Being cooped up in an office is no fun but being broke and not able to pay your bills is even worse.
That's the most important thing that keeps me motivated and from becoming insane. If I don't have the job I don't have a house or food to eat.