Thanks Jose

I feel your shoulder needs some stability, the recurrent issues you are having now indicates that although the cause of your re-occurring supraspinatus tendinopathy is due to reduced subacromial space (which SAD) sorted out, you do not have the right muscle balance in your shoulder joint complex to keep that space free everything time you use your arm.

My thoughts on these new problem is an acromioclavicular joint lesion.

Im not sure what another surgery will be hoping to achieve except draining some of the fluid or stitching the muscular tears (unlikley since it does not feel like a significant tear)...

Try a physio...(which you should have seen soon after your surgery)...

The aim of Physio should be to

1) reduce your pain... (cold treatment)
2) provide temporary shoulder stability so that the weight of your arm does not pull on the AC joint anymore than usual
3) maintain the Range of motion available within pain free limits through self active assisted exercises
4) once pain is better controlled and the AC joint is not as painful, gentle but progressive strengthening exercises aim at maintaining flexibility and strength in the supraspinatus muscle (eccentric )

You would need a detailed examination to see what pathomechanics are occuring in your shoulder to provide you with specific exercise to improve scapulohumeral rythmn.
All these should only be considered when your pain has significantly improved and you are virtually painfree on active and passive movement

in the meantime, I would suggest putting your arm in a sling, or always giving it some support and not letting it hang down by your side i.e...always resting it on an arm rest when sitting...
avoid trying to lift anything with that arm...
use the other arm to assist in lifting it up if you want to reach for something above
avoid any painful range even if all you feel is little pain...

I think the prognosis for your arm can be good

cheers