Fights Where You Live
The problem
Nullsec has some of the least lucrative content in the game for the effort it takes, and the standard fix is a high-sec alt — the game telling you to leave to get paid. Meanwhile the space between groups is empty, so content means travelling further and further for it. That's tedium, and tedium is why people stop logging in.
What I'd push for
A zone of NPC space in every nullsec region, built to be that region's hub: missions, sites, a market, a station anyone can dock at. Everything high-sec has, without leaving null. Low-sec players come for the content if it pays. So do the neighbours. That proximity is the point — put people next to each other and fights happen without anyone organising them.
And income that's worth taking
Alliances need passive income sources that don't depend on fielding a wing of miners and ratters, so a lean PvP-focused group isn't slowly starved out. Those sources should be vulnerable: a short spool-up to activate, so another group can take a system, hack it, and divert the output until the owners come to kill them for it.
What it changes
Small fights constantly, medium fights frequently over income you can steal, and large fights reserved for what deserves them — citadels.