One thing to keep in mind that the game tends to distribute sims across many public lots. So the more you have in the game, the fewer will be at any one place. Some people delete certain EA-made preplaced lots; others set the ones they're not using to "no visitors allowed." I believe here are mod-related ways to accomplish the same thing, but I don't know what you like to use. It's also true that sims start showing up in greater numbers after you send one of yours to a lot, so you could try arriving early and reading or building skills or somethng like that.
A lot of people do better when they start with a story in mind, including me—I find it feels like busywork when I'm just building skills and completing tasks for the sake of advancing. It's also fun to commit to trying something you've never done before, like having lots of kids instead of only a few or trying to make it as a collector/gatherer instead of having a proper career.
The LEPacy-type challenge can also be intriguing, especially if you're just getting back into the game. You unlock one EP (you can include SPs if you want to prolong the legacy) at each generation, when the heir is born, reaches YA, or completes a LTW, whichever you prefer. It's counterintuitive, but sometimes having fewer packs and fewer things to do can make your existing options more attractive (the paralysis of choice and all that).
Whatever you do, pay attention to what you're thinking about while you're playing. If something appeals to you while you're going in a different direction, keep it in mind for the next sim, generation, or family. There are so many options in the game that it's almost impossible to cover them all in their various combinations, and that's a huge part of why there are still so many of us playing the game nine years after its arrival.