resize ext4 volume in amazon linux server : Couldn't find valid filesystem superblock

I updated an EBS volume from 30Gb to 40Gb and I'm having hard time to extend it in the system:

root@ip:/home/cpmuser# lsblk
NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop0         7:0    0 55.4M  1 loop /snap/core18/2066
loop1         7:1    0 99.4M  1 loop /snap/core/11316
loop2         7:2    0 32.3M  1 loop /snap/amazon-ssm-agent/2996
loop3         7:3    0 99.4M  1 loop /snap/core/11187
loop4         7:4    0 33.3M  1 loop /snap/amazon-ssm-agent/3552
loop6         7:6    0 55.5M  1 loop /snap/core18/2074
nvme1n1     259:0    0   60G  0 disk /cpmdata
nvme0n1     259:1    0   40G  0 disk
└─nvme0n1p1 259:2    0   30G  0 part /
root@ip:/home/cpmuser# resize2fs /dev/nvme0n1
resize2fs 1.44.1 (24-Mar-2018)
resize2fs: Device or resource busy while trying to open /dev/nvme0n1
Couldn't find valid filesystem superblock.

this is the output of the command df -h:

root@ip-:/home/cpmuser# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             16G     0   16G   0% /dev
tmpfs           3.1G  307M  2.8G  10% /run
/dev/nvme0n1p1   30G   30G     0 100% /
tmpfs            16G     0   16G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs            16G     0   16G   0% /sys/fs/cgroup
/dev/loop0       56M   56M     0 100% /snap/core18/2066
/dev/loop2       33M   33M     0 100% /snap/amazon-ssm-agent/2996
/dev/loop3      100M  100M     0 100% /snap/core/11187
/dev/loop4       34M   34M     0 100% /snap/amazon-ssm-agent/3552
/dev/nvme1n1     59G  1.4G   55G   3% /cpmdata
/dev/loop6       56M   56M     0 100% /snap/core18/2074
/dev/loop1      100M  100M     0 100% /snap/core/11316
tmpfs           3.1G     0  3.1G   0% /run/user/1001

I tried many commands: resize2fs , growpart, none worked.