Your inlet NOX sensor fault combined with the filter ash being moderately high is what is derating your engine. The NOX sensor issue needs to be diagnosed and repaired. There is an Aftertreatment NOX sensor test that can be performed, but unfortunately, you need the dealer with Service Advisor to perform that step. That test is usually performed for diagnostics and post repair to make sure the sensor fixes the issue. Most likely, the sensor is bad, but first make sure the intake and exhaust system are sound with no leaks, missing plugs, loose sensors/probes, etc. Also, make sure the sensor module has good power and ground. Then a service regeneration (Parked Cleaning) needs to be performed. Again, the dealer may have to do this if it cannot be initiated through the monitor.
Do note, with a calculated ash level high code, a service regeneration may not be able to solve the issue. Service regenerations are for soot levels being high. After regeneration, the soot turns to ash, so if the ash level is high, then the DPF needs to be cleaned. If it needs to be cleaned, then the dealer will have to be involved to "reset" the ash loading model so the ECU knows that the DPF has been cleaned.