I am a huge advocate of the Gang warfare idea, faction v faction, capture points (use the spray points) control map areas and by the end of a timer the factions get a relevant boost to, money or rep gain or something immaterial, maybe even a bonus item for rental for a time period related to the % of area they held.
but that is another thread (well it can be the same one but baby steps)
OCD (Open Combat District) needs a focus, a global objective that will get everyone fighting for a reason, rather than just doing jumps and shooting their friends for the lulz.
Add a Capture area objective, Filler bar, longer than normal, maybe takes 5 mins of constant presence to capture it.
Repeat this a few times (maybe go for 30 mins, so 6 points)
Winning side get Cash benefits or maybe an item in the mail (lease for a jmb special or the new weapon you are testing/selling)
it probably isn't a huge change (snowball event isn't it?) and it would encourage activity by rewarding participants and the faction. (so cash reward for participants, item reward for whole faction when playing in that district or whatever)
anyway, that's the idea, have a poke at it, discuss below.