Please follow this troubleshooting guideline meticulously. Getting Started with the MyoWare® 2.0 Muscle Sensor Ecosystem - SparkFun Learn
If nothing improves, post a photo of your setup so that SparkFun officials can look at that and take necessary steps to provide proper support. Here are some more links that may be helpful.
Myoware Muscle Sensor Not Working? Help! - Sensors - Arduino Forum
cyborg hand ver 0.1 - Share Project - PCBWay
MYOWARE 2.0 MUSCLE SENSOR NOT FUNCTIONING NORMALLY
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