Light, shorter, on the wacky side:

• Stephanie Plum series by Janet Evanovich. Stephanie Plum is a little crazy, but the world she’s in is crazier, and she takes it all in stride. She’s a bounty hunter working for her cousin’s bail bond agency chasing fugitives, and while there’s mild profanity and some messed up situations, the tone is incredibly light and funny. This is one of my favorites that I reread frequently, and I really enjoy Lorelei King’s reading of the audiobooks. There’s some minor carry over, but you don’t need to start at the beginning.
• Miss Fortune series by Jana DeLeon. Fortune Redding is a CIA agent hiding in a tiny town of Louisiana because she pissed off an arms dealer by breaking her cover to protect a kid. I looked a long time for other books comparable in tone to Stephanie Plum, and this is my best example. More stupid nonsense and enjoyable characters. Starting at the beginning isn’t strictly necessary, but there’s more underlying plot arc through the series.
• Haunting Danielle series by Bobbi Holmes. You’d probably be surprised by how many lengthy series there are centered around a haunted B&B owner solving murders. This is my favorite though. It’s similar in the light, nonsensical tone, but with an OK (if not super deep) mystical element. You won’t be lost starting wherever, but you’ll miss out on character development if you start partway in.
• Jack Reacher series by Lee Child. The Amazon series takes it dark and hardcore, and that stuff all happens in the books, but they don’t really feel dark reading them. Much more action oriented, but Reacher sees something wrong, gets hooked in one way or another, and comes in like a nuke ripping the bad guys to shreds. These theoretically have carry over, but you can very easily read them in any order.

Yeah, it’s a lot, but I could do more. I read way too many audiobooks.