2014 DS3 Airdreamplus1.6 electrical issues 95k miles

[Tenacious65]

Hi everyone I have an issue with the stop start system/alternator which is also affecting cruise control, reversing sensors, and power steering (which has stopped working). A new stop/start compliant battery was fitted 2 years ago but was not paired with the car. Very infrequently a red battery warning is displayed. The car starts and runs ok.
I've been told that the car is beyond economic repair just want expert opinion on here!
Thanks in advance please let me know if more information is needed to help diagnose.