Where to go nXw?

I need levels for golden mobster (currently at lvl106) with 97k gold and 5k crystals
I have now gotten war machine and i won my first solo match of nightmare

Some towers i havent unlocked are: combat medic, commander, refractor, oil derick, behemoth factory, combat drone, helicopter, cryo blaster, ghost, gmine layer, gmob, granger, jet trooper, john, machine gunner, medic, mine layer, patrol boat, sentry, slammer and warship.
and i have no event towers.

What should i get(after gmob) and tips to farm gold after?