All color negatives degrade in their own unique way. There's no single action that will magically fix your scans. Heck, there's no single action that will reliably balance your brand new color negatives.
Your best bet is some kind of 'intelligent' auto-color restoration tool; either within Photoshop, or one of the several pieces of software aimed specifically at scanned color negatives. The result will still be hit & miss.
IMO your best bet is to take one or two frames from a roll, or perhaps even an entire 'contact sheet' of scans, and then color balance those to satisfaction; then apply the same curve to all scans of the same roll. It helps (a lot!!!) if you scan the whole thing so that the balanced that comes out of the scanner is identical. The most straightforward way to achieve this is to scan the negatives as color slides instead, ensuring to capture 16 bit color depth as you'll run into posterization problems otherwise later on. Then invert the scans & color balance as described.