I'm still playing. I set myself the challenge of using everything I ever bought and/or was gifted from the official EA content.
To do this, I made separate folders for every world, so I could just install the items that fit in with that world. I have about 25 The Sims 3 folders on my computer, one for each town I play (that includes a few user-made worlds).
https://i.imgur.com/VyQeGBZ.jpg
So, for instance all my future-themed content is of course installed in Lunar Lakes, while the Tiki sets are in Sunlit Tides, etc. I play all the pre-mades, rotation-style, and place community lots where I think they make sense... Not every town has every different type of lot, because sometimes there just isn't room.
https://i.imgur.com/RHnZjda.jpg
Sometimes I feel like tweaking a world, sometimes I just want to play so I just start up a town that I have already completely tweaked to see what everyone is up to.
https://i.imgur.com/ZEBcHIe.jpg
I made a start with every world, but not every world is totally finished (is anything ever totally finished in this game?) so I think I'll have enough to keep myself entertained for at least another four or five years (after which my computer will probably need to be replaced, and chances are I won't get the game to run any longer...)
Having said that, I did recently manage to install The Sims (a.k.a. Sims 1) on Windows 10, and it plays beautifully. So there's hope yet.
https://i.imgur.com/DNArwu3.jpg
(Sorry - I just LOVE the scenery!!)