For a brand new player that's actually waited until 12 years of Sims 4, I recommend 1st the basics packs.
Seasons, Cats & Dogs, Growing Together, and Parenthood
Then I recommend the fun Historical themes if the player likes them in packs & kits:
Get Together, Cottage Living, Horse Ranch, Castle Estate, Rivera Retreat, Royalty, Lady Bridgeton & Tea Time
For fun Fantasy themes, I recommend the following packs, kits & one Maker Cc:
Island Living, Enchanted By Nature, Realm of Magic, Crystal Creations, SpongeBob & Wonderland Kit & Maker Cc
As for the Spooky themes, I recommend the following packs:
Life & Death, Vampires, Werewolves, Spooky & Paranormal
For School themes, I recommend the following packs & Kits:
High School, Discover University, Grunge, Urban, Goth & Clueless/MG
For Camping themes, I recommend the following packs & Kits:
Adventure Awaits, Outdoor Retreat & Little Campers
Now for the fun Sci-Fi themes, I recommend the following packs:
Get To Work, Strangerville & JTB
As for Vintage themes, I recommend the following packs & kits:
Lovestruck, Vintage Glamour, Bowling, Silver Screen & Autumn
Please share this info for players that don't know Sims 4. All players have at least one favorite theme that they enjoy playing.