Php Myadmin giving following error mysqli_connect(): (HY000/2002): No such file or directory

I transferred my database to another volume on digital ocean server. Database is working fine but I am unable to access it via phpmyadmin in cpanel. I used following procedure to transfer.

sudo mysql

ALTER USER 'username'@'localhost' IDENTIFIED WITH mysql_native_password BY 'mypassword';

exit

mysql -u sabkiapp -p

Check data dir with select @@datadir; and it is /var/lib/mysql/

exit

sudo systemctl stop mysqld

sudo systemctl status mysqld

sudo rsync -av /var/lib/mysql /mnt/myvolume

sudo mv /var/lib/mysql /var/lib/mysql.bak

sudo vi /etc/my.cnf

datadir=/mnt/myvolume/mysql
socket=/mnt/myvolume/mysql/mysql.sock

[client]
port=3306
socket=/mnt/myvolume/mysql/mysql.sock


sudo systemctl start mysqld
sudo systemctl status mysqld

mysql -u root -p

select @@datadir;