-NCT 127 and dream generate the most revenue for SM for the last few years due to album sales and touring (127 especially).
-Red velvet is still growing having recently reached 1 million sales for an album, is well respected in the industry and can always be relied on for GP hits.
-Aespa sold 1.6 million with the girls album
-Super junior sells well as a group + has a dedicated fandom that shows up to concerts, their individual activities such as variety also generate a lot of revenue. TVXQ also generates huge touring income in Japan and shinee is shinee. They aren't going anywhere.
The group with an unstable footing and least successful is wayv. This is due to factors outside their control but they are the only ones in peril of disbandment with new management.
Soloists is a very broad category - Taeyeon, Baekhyun are certainly not in the same conversation as Kangta for example.