You can play another game until you miss you sims ! That's what i did... and the same goes for this other game franchise; i have been playing need for speed since 1998 (high stakes) so I just realized whoa that's like, alot ! And the sims, btw i took a break from all videogaming from 2002 to 2009. So i had a few gaps of years without touching it. Another franchise i was active in was, Simcity and when it got canned i felt depressed... and so it wasnt until TheSims4 that i got into this universe, and it has been almost ten years of TS4, and in those years i also had a few gaps of many months.
All that to say, I felt like you just a couple months ago, i had just bought 2 packs and was having fun establishing new neighbourhoods and lots and setup lots and households, but felt uninspired and the reaper quest came and it took away my desire to play altogether.
Now I am looking forward to start new adventures and i got a couple of ideas already, i miss my sims and will try to evolve my playastyle to include more actual gameplay. I got to a point of no return w building and it took me to step back to re assess my purpose with TS4. Taking a step back help re focus sometimes. So there surely will be another trigger down the line for you so i wouldnt be too worried about it, once a simmer always a simmer !