My 1st gen quit her self-employed career and got a rabbit-hole job for the opportunities. It doesn't matter which one - even if it's one you intend to have someone else do, except that will put a few career opportunities off limits - because the idea is that you'll work until you get your last BlackOp and then quit... I got a lot of opportunities out of the Politics career.
(This only works as long as the rabbit hole career in question is not in a combined building. I don't know what town you're in - Sunset Valley, Twinbrook, or Riverview should be okay, but the rest have at least a couple combined buildings.)
Also, learn a new skill, to broaden the base for skill opps. And if you have Celebrities turned on, your phone should be ringing off the hook with celebrity opportunities....