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Thank both of you for responding,
i uploaded it by changing all the collation in the old sql file from      utf8mb4_0900_ai_ci to utf8mb4_general_ci      is it ok?
I can't do the pointing domain step, my hosting site would not allow to change the name sever
And if i want to migrate the shop, are the steps below ok:

I put the shop on maintaince mode,change the url in the back office,copy the back up and paste it on the new host file page,do some of editing in the config/setting like in the clip on the youtube(this clip https://www.youtube .com/watch?v=4rw7gwny-AU). 
Are all these steps good ? And how can i change the new website name to my old website name or how can i migrate keeping my old website name.
Thank you guys in advance.