Issues with rounded shoulders?

A common reason some people develop a forward posture is that their training is front-dominant. If the muscles on the front of your body are being trained hard, but your back muscles are neglected, your shoulders tend to pull forward. So first, aim to do a similar number push and pull exercises in your routine to promote balanced shoulder development.
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Next, we also want to actively train external rotation of the shoulder to help pull your shoulders back and improve the stability of your shoulder joint. Exercises like facepulls are great to include to train the external rotators and your rear delts. Also consider band pullaparts to train the mid-traps and rear delts.
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Lastly, posture is not just important in training, but also about how you sit in everyday life. Try to be conscious of how you sit behind a desk, if you find yourself hunching forward, aim to do simple dynamic stretches for the shoulder during your break. Every few hours, stand up from your desk and perform 1 dynamic stretch