Lifetime appointment is a pretty good gig. Already speculation that Judge Ketanji Brown Jackson, currently sitting on the DC Court of Appeals, is at the top of the list.
https://thehill.com/regulation/court-battles/560353-justice-breyer-announces-retirement-from-supreme-court
https://thehill.com/regulation/court-battles/560353-justice-breyer-announces-retirement-from-supreme-court