Mounted Volume reports a different total size than DO and lsblk

Some weeks ago I resize a volume from 200G to 400G, however, after mounting the volume df -h reports a different size compared to the output of lsblk:

root@nextcloud-ubuntu-22-10:~# mount -o discard,defaults,noatime /dev/disk/by-id/scsi-0DO_Volume_volume-nyc1-01 /mnt/volume_nyc1_01
root@nextcloud-ubuntu-22-10:~# lsblk
NAME    MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
loop0     7:0    0  44.5M  1 loop /snap/certbot/2913
loop1     7:1    0 116.8M  1 loop /snap/core/14946
loop2     7:2    0  63.2M  1 loop /snap/core20/1623
loop4     7:4    0  53.2M  1 loop /snap/snapd/18933
loop5     7:5    0  49.8M  1 loop /snap/snapd/18596
loop6     7:6    0    73M  1 loop /snap/core22/607
loop7     7:7    0  63.3M  1 loop /snap/core20/1852
loop8     7:8    0   163M  1 loop /snap/lxd/24643
loop9     7:9    0 164.3M  1 loop /snap/lxd/24758
sda       8:0    0   400G  0 disk /mnt/volume_nyc1_01
vda     252:0    0    60G  0 disk 
├─vda1  252:1    0  59.9G  0 part /
├─vda14 252:14   0     4M  0 part 
└─vda15 252:15   0   106M  0 part /boot/efi
vdb     252:16   0   474K  1 disk 
root@nextcloud-ubuntu-22-10:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
tmpfs           795M  1.6M  794M   1% /run
/dev/vda1        58G  9.5G   49G  17% /
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/vda15      105M  6.1M   99M   6% /boot/efi
overlay          58G  9.5G   49G  17% /var/lib/docker/overlay2/1f39e60670311eb27761adb1e9e58082a3e22e3ad5c13f0fd720506efd9db8a5/merged
overlay          58G  9.5G   49G  17% /var/lib/docker/overlay2/5a81b10e3777a7388b0ce12dba4b404c3de4a44a6caf4f657a1cdf9a9bf04977/merged
overlay          58G  9.5G   49G  17% /var/lib/docker/overlay2/fb855e28ecb6c25b1975eeab2010dfb562912f3cf69af4b412b8080eb9844654/merged
overlay          58G  9.5G   49G  17% /var/lib/docker/overlay2/1fdf016c1a5552b946f3a02e624617b5a415ad587d9782c372ad5d66c35b040f/merged
overlay          58G  9.5G   49G  17% /var/lib/docker/overlay2/d17a4792dc72c43153bb8bc90c97fb15cae6b54a11e6e5e9085d1559fbaa06cc/merged
overlay          58G  9.5G   49G  17% /var/lib/docker/overlay2/a423edd6beaf2679c8ce19139121fa9f6f76f7884a34f3ce5b3edf312825a64c/merged
tmpfs           795M  4.0K  795M   1% /run/user/0
/dev/sda        149G   86G   56G  61% /mnt/volume_nyc1_01

Sadly, my Nextcloud instance reports lack of free space, which is not true since the volume has enough room. How can I fix this?