I've been blowing through series in recent years.
Series I have finished:
The Silo Saga, Hugh Howy - 3 books, enjoyed all of them
The Final Architecture, Adrian Tchaikovsky - 3 books, loved them all
Children of Time Novels, Adrian Tchaikovsky - 3 Books, they are exceptionally well done, but I can't say I really enjoy them. They frankly make me feel sad
Undying Mercenaries, BV Larson - 19 books so far. They're light, fun military Sci-Fi. As long as you don't take it too serious, they're a blast.
Steamborn Series, Eric Asher - 7 books so far. I love the setting of steampunk, but have never reallyr ead much in it. This came on some amazon recommendation and I've enjoyed it so far.
Expeditionary Force, RC Bray - 15 books. Much like Undying Mercenaries, it's light, fun military Sci-fi and absolutely hilarious. Loved it.
Frontlines, Eric Dove - 8 books. I think this series is finished. More serious military Sci-fi, but not too deep. Enjoyed it as a light read.
The Long Winter, AG Riddle - 3 books. Loved the first one, kind of liked the second, really didn't care for the third one.
The Interdependency, John Scalzi - 3 books. I read the first one back in 2015 and completely forgot about it. Picked up the last two last year and while it wasn't bad, definitely not his best work either.
Academy, Jack McDevitt - 8 books. I read these on and off for years. Loved the early ones but really felt the last few fizzled out.
Stand along books:
The Doors of Eden, Adrian Tchaikovsky - He's a really smart author. This book was a little difficult at the beginning, but I really liked it overall.
Project Hail Mary, Andy Weir - Not as good as the Martian, better than Artemis