So far 14 incumbent Democrats and 7 GOP incumbents are not running for their House seats next year. There will be more (like George Santos, for example). Thirteen are running for statewide office— 10 Democrats and 3 Republicans:
Colin Allred (New Dem-TX)- is running a long shot Senate race
His House seat is safely blue- D+14
Jim Banks (R-IN)- is a likely winner for the open Indiana Senate seat
His House seat is safely red- R+18
Dan Bishop (R-NC)- is in a competitive race for North Carolina Attorney General
His House seat is safely red- R+19
Lisa Blunt Rochester (New Dem-DE)- will walk into the Senate seat
Her House seat is safely blue- D+7
Ruben Gallego (D-AZ)- is running for a Senate seat against Kyrsten Sinema and Kari Lake (leans blue)
His House seat is safely blue- D+24
Jeff Jackson (New Dem-NC)- is in a competitive race for North Carolina Attorney General
His House seat was gerrymandered to make room for the slob you drew the new boundaries, Tim Moore
Andy Kim (D-NJ)- running in a long shot primary for Bob Menendez’s seat against Tammy Murphy, governor's wife and "former" Republican
His House seat is fairly safely blue- D+6
Barbara Lee (D-CA)- long shot bid to the open Senate seat
Her House seat is 100% safe- D+40
Alex Mooney (R-WV)- suicidal primary run for a Senate seat
His House seat is safely red- R+22
Katie Porter (D-CA)- competitive bid for the open Senate seat
Her House seat is swingy with an especially bad Democratic frontrunner- D+3
Adam Schiff (D-CA)- competitive bid for the open Senate seat
His House seat is safely blue- D+23
Elissa Slotkin (New Dem-MI)- competitive bid for the open Senate seat
Her House seat leans red- R+2
David Trone (New Dem-MD)- suicidal primary run for an open Senate seat likely to be won by Angela Alsobrooks
His House seat is swingy- D+2
4 Democrats and 4 Republicans are flay out retiring:
Earl Blumenauer (D-OR), 75
Safe Democratic seat- D+22
Ken Buck (R-CO), 64, sick of Trump and congressional dysfunction
Safe Republican seat- R+13
Kay Granger (R-TX), 80
Safe Republican seat- R+12
Debbie Lesko (R-AZ), 64, sick of congressional dysfunction
Safe Republican seat- R+10
Grace Napolitano (D-CA), 86
Safe Democratic seat- D+15
John Sarbanes (D-MD), 61
Safe Democratic seat- D+10
Victoria Spartz (R-IN), 46, sick of congressional dysfunction
Safe Republican seat- R+11
Jennifer Weston (New Dem-VA), 55, leaving because of grievius illness
Safe Democratic seat- D+6