In order to connect remotely you have to have MysqL bind port: 3306 to your machines IP in /etc/MysqL/MysqL.conf.d/MysqLd.cnf Then you have to have created the user in both localhost and '%' wildcard and grant permissions on all DB's as such . See below:

Replace xxx with your IP Address （normally 0.0.0.0）

bind-address= xxx.xxx.xxx.xxx

then

CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypass';
CREATE USER 'myuser'@'%' IDENTIFIED BY 'mypass';

Then

GRANT ALL ON *.* TO 'myuser'@'localhost';
GRANT ALL ON *.* TO 'myuser'@'%';

Depending on your OS you may have to open port 3306 to allow remote connections.

restart MysqL service:

sudo systemctl restart MysqL