@ Joemax:

caveat: i don't know your stats, so the information i provide may not totally reflect your situation.

So, I should camp, yes?
hell yes!!! not unless you want to get a rude welcome from the biggies at high levels.

And if this is the case, how exactly?
1. concentrate on investing your income on defense buildings. build + upgrade as many defense buildings as possible.
2. don't neglect your economy. when possible, upgrade your money buildings. also, expand your hood and construct income buildings- at your level movie theater is a gold mine.
3. STOP doing challenges/quests. you don't want to level up very fast.
4. farm respect points judiciously (laundromats are the way to go, but you need extreme patience!)

Do I just stop doing all jobs and challenges, and just farm laundromats?
yes, to both questions!

Final advice: if you are maxed out on mafia members, downsize to a reasonable number. A rough estimate of a well armed mafia is 30 attack points per mafia (e.g. for mafia size of 100- having 3000 attack points is reasonable).