Where are Chen and Castilblanco?

I haven’t written a new Chen and Castilblanco mystery/crime/thriller novel for years (the last, Gaia and the Goliaths, was published in 2017). The detectives were still alive and kicking in the last novel, Chen and husband Eric Kumala with a new baby and Castilblanco and wife Pam Stuart with two adopted children. Was that an appropriate way to end the series? I thought it might be a positive way to do that, a life-goes-on message where Dao-Ming Chen mellows out as a new mom and Rollie Castilbla...