Some ideas to make nullsec more interesting.
Remove SOV (the entosis garbage). And allow anchoring only at planets (and moons for the mining stations) Remove the ESS system and add make local act the same as in wormholes. Allow for communication device to be deployed to restore local and use the system now used for the ESS to increae or decrease its fuel needs. The device would be a deployable that needs to be redeployed and fueled regularly. This will make nullsec a way more unpredictable environment and force large corporations/alliances to actually have scouts etc to keep intel on their systems. I would expect you get blacked out regions in between the main area’s of big alliances