I have a atlassian add-on which was running in the server. I want it to be enabled as a cloud too. What are the changes should be applied for this?
You'll need to re-write it as a Connect add-on for Cloud.
The two types of add-on are structurally very very different, it's not just a few changes here and there, you will need to migrate your logic into a completely different framework.
Start at https://developer.atlassian.com/static/connect/docs/latest/index.html and expect to change the way you store data, implement the interface and probably the language your logic is written in.
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