I'm sorry to hear about your injury and equipment limitations. Here are a few additional exercises you can try that don't require any equipment and are low-impact:

Isometric curls: Stand with your arms by your sides and your palms facing forward. Make a fist and contract your biceps as hard as you can for 10-15 seconds, then release. Repeat for several sets.

Towel curls: Grab a towel or a t-shirt and hold it with both hands, palms facing up. Place your feet hip-width apart and step on the towel with your left foot. Hold the other end of the towel with your right hand and curl it up towards your shoulder, keeping your elbow close to your body. Repeat on the other side.

Doorway curls: Stand facing a doorway and place your hands on either side of the frame, with your palms facing forward. Lean forward slightly and push against the doorway with your arms, engaging your biceps. Hold for a few seconds, then release and repeat.

Bodyweight curls: Sit on the edge of a chair or bench with your feet flat on the ground. Place your hands on the edge of the seat, fingers pointing forward. Slowly lift your body up off the chair, bending your elbows and bringing your body towards the chair. Lower yourself back down and repeat.

Remember to listen to your body and not push yourself too hard, especially if you are dealing with an injury. If any of these exercises cause pain or discomfort, stop immediately and consult with a medical professional.
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