If you don't mind mods, i highly recommend using MC command center. When i have large families of 6 or 7 i set the game speed slower so i don't feel so rushed to get everything done and it's easier to raise toddlers that way as well. If you're not into mods, like what jpkarlsen said, pausing and filling up everyone's Que with tasks before going back to live mode helps a lot.
Another way i play sometimes is i choose what sim i want to control for the day. I just let the other sims do whatever they want with full autonomy. Having the lifespan on long i feel helps with it because you don't feel rushed to get everyone's whims/aspirations completed. You can really take your time and experience the game more than worrying about everyone's needs. This way you can also afford to not control all your sims for one day because they'll have plenty of time to catch up on whatever progress you want to make with them.. if that makes sense?
other mods that help me are the go explore mod by KawaiiStacie and social activities by LittleMsSam. These provide rabbit hole activities to send your sims to if you want a break from playing them. Also, UI cheats extension is incredibly helpful if you don't care about cheating needs. I don't mind cheating when i have a big family, it allows be to experience more game play rather than sending a whole bunch of sims to the toilet all day.
