Asklemmy

Any of the books narrated by Peter Kenny in the Culture series by Iain M. Banks. Banks’ books are my favorite Sci-Fi, and Kenny does such an impressive job of doing an understated reading. He “does the voices” really well so you can tell the characters apart, but it’s all very subtle and easy to listen to. He also does the “techno-babble” so damn well, and captures Banks’ sense of humor perfectly.

I think there’s only one of the Culture books that he didn’t narrate, can’t remember which at the moment.

A couple easier listens from my library:

Spells, Swords, & Stealth series by Drew Hayes. One of my favorites, though it works much better if you've played D&D.
Bobiverse series by Dennis E. Taylor. Just all around fun sci-fi.
Heartstrikers series by Rachel Aaron. I'm not normally one for urban fantasy, but this series and the two follow-up series by Aaron were great. I did find the narration a bit flat, but passable.
Space Team: The Collected Adventures, Volume 1. Sci-fi outlaw adventure. Might be about the perfect series for listening while doing something else. And as a bonus you get a ton on content for 1 credit.
Expeditionary Force series by Craig Alanson. Military sci-fi. With the military being the current day military. Bonus points for poking fun at "Death by PowerPoint".

Another option I use is to look at the Great Courses Plus titles which are included in the Plus subscription and listen to those. I have a soft spot for Near Eastern History during the Bronze Age and can happily listen to a lecture on the Achaemenid Empire for hours.

• Red Rising
• Golden Son
• Morning Star

All narrated by Tim Gerard Reynolds, and he's AWESOME.

THEN also

• Iron Gold
• Dark Age
• Light Bringer

Also narrated by Tim Gerard Reynolds, but there are also more voiced character in these, so there's more variety, and it's great.

I really like Red Rising.