Here are all my current series I'm in the middle of reading and what book is next for me to read. You can look at the rest of my list for ideas too, but I thought this would give you plenty of options. Also, if anything here reminds you of another great series that I am not aware of, feel free to recommend it!
Mistborn - Brandon Sanderson
I'm currently in era 2, the wax and wayne series. The next book I need to read is The Bands of Mourning
Culture Series by Iain M. Banks
I found the book Excession used at copperfields and want to read more from this series. I don't have any other books from the series. The first two books are called Consider Phlebas and the Player of Games
Red Rising Series by Pierce Brown
I have read the first book in this series and the next one I'm on is Golden Son, the 2nd book in the series. I don't own any of the books though and I intend to eventually collect them all.
Arcanum Unbounded: The Cosmere Collection by Brandon Sanderson
This one is a collection of multiple stories from all his different series
Dresden Files by Jim Butcher
The next book for me to read is book 10, Small Favor. I am working my way through the whole series.