That’s a tricky question, because after everything that happened earlier this year, a lot of authors pulled their works from Riptide.
I’ll recommend Where Death Meets the Devil by LJ Hayward - I actually supplied a blurb for the book when it came out - but none of the follow-ups to what’s become an intriguing series are being sold by Riptide. (You can find them on Amazon, or check out the author’s personal website).
I also just started reading Counterpoint by Anna Zabo, who also used to be a Riptide author but pulled almost all their works. (I’m only a chapter deep into Counterpoint, but so far I’m really enjoying it!)
If you’re looking to take a break with something tonally different from the Seven of Spades series, Quinn Anderson is a very prolific Riptide author who writes sweet contemporary romances. She also seems to be a lovely person, from the interaction I’ve had with her!