Cluster degraded after adding OSDs to increase capacity

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My 3-node Ceph cluster (14.2.4) has been running fine for months. However,
my data pool became close to full a couple of weeks ago, so I added 12 new
OSDs, roughly doubling the capacity of the cluster. However, the pool size
has not changed, and the health of the cluster has changed for the worse.
The dashboard shows the following cluster status:

   - PG_DEGRADED_FULL: Degraded data redundancy (low space): 2 pgs
   backfill_toofull
   - POOL_NEARFULL: 6 pool(s) nearfull
   - OSD_NEARFULL: 1 nearfull osd(s)

Output from ceph -s:

  cluster:
    id:     e5a47160-a302-462a-8fa4-1e533e1edd4e
    health: HEALTH_ERR
            1 nearfull osd(s)
            6 pool(s) nearfull
            Degraded data redundancy (low space): 2 pgs backfill_toofull

  services:
    mon: 3 daemons, quorum ceph01,ceph02,ceph03 (age 5w)
    mgr: ceph01(active, since 4w), standbys: ceph03, ceph02
    mds: cephfs:1 {0=ceph01=up:active} 2 up:standby
    osd: 33 osds: 33 up (since 43h), 33 in (since 43h); 1094 remapped pgs
    rgw: 3 daemons active (ceph01, ceph02, ceph03)

  data:
    pools:   6 pools, 1632 pgs
    objects: 134.50M objects, 7.8 TiB
    usage:   42 TiB used, 81 TiB / 123 TiB avail
    pgs:     213786007/403501920 objects misplaced (52.983%)
             1088 active+remapped+backfill_wait
             538  active+clean
             4    active+remapped+backfilling
             2    active+remapped+backfill_wait+backfill_toofull

  io:
    recovery: 477 KiB/s, 330 keys/s, 29 objects/s

Can someone steer me in the right direction for how to get my cluster
healthy again?

Thanks in advance!

-Dallas
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