The areas of retina affected by CSR are like scars and may not improve significantly. However, the darker coloured fresh vegetables and fruits may help. Antioxidants like selenium, Zinc and vitamin A along with other vitamins may help as well, as you are only young at 40, you have to think of future. Stem cell therapy will not help.
Although your vision is poor in this eye, the fact that it improves with pin hole suggests that further improvement is possible with proper glasses. There is a field of vision defect but your vision all around that should remain good and is very useful for navigational vision. There is no harm in reading and writing as much as you like, make sure of good lighting but you may need reading/bifocal or varifocal glasses.