How to move vps ubuntu 16.04 ee3 website wordpress https to new vps 18.04 ee4

I have vps ubuntu 16.04 setup ee3 website wordpress https. I use plugin backup my website (code+database) up to cloud driver. Before use ee3. I only need create new wordpress on new vps. Then delete code new wordpress and wget file backup from cloud driver. I use unzip code old wordpress, import database, edit wp-config.php is complete. Now ee4 not use “ee site ex.com cd”. I cannot get code old website when ee4 use docker. Are you help me guide move vps ubuntu 16.04 ee3 website wordpress https to new vps 18.04 ee4?
Or send for me link setup ee3.