@joaquito99 I can see how playing the same way over and over would get boring pretty quickly. In Sims 3, I have a few completely different styles of gameplay that I return to, with some variation, whenever I get bored with my existing game. Here are some ideas:
I've started with a couple and gotten the woman pregnant with twins right away (the boombox follows her around for the first 24 hours blasting kids' music), and then another kid right after that. It's chaos, and the fact that they have no money makes things almost impossible, but it's also a lot of fun.
On that note, I sometimes force encourage my sims to have a huge family, more even than the 8 sim household limit (mods are helpful), and let the kids each be and do something different. It's also chaos, but there's always something to do, relationships to work on or different skills to build, plus the older kids can help with the younger ones. I marry each kid off when I'm bored with them and keep the one or two I still want to play.
I sometimes make a single sim who... let's go with "romances"... half the town, and no matter how hard he works (he really doesn't), paying for all those kids is nearly impossible. You can use mods to force child support, or just transfer money directly via mod or cheat.
I haven't done it, but some people like the homeless sim challenge, which is rags to riches but with an emphasis on the rags part. Other people move out a child of their existing sims and give them almost nothing, so the process repeats with each generation.
With large families especially, it's fun to have a pack like Generations (for the interactions) or Seasons (for the festivals) to give the sims more activities to do together. I also play on normal lifespan, or 1.5 x normal (modified in game options), so there's some sense of progression. I'm almost never bored with all my sims by the time they die, that is, if I let them die the first time around.
As for getting bored with Sims 4... I can't help you there. But I doubt anyone wants to hear my take on that game, so I'll leave it at that.