I’m an experienced Solar2D developer and I can tell that Defold’s paradigm is quite different.
It would be hard to port a game one to one so to say. I had to make my own little framework on top of Defold to feel more like in Solar2D, it allows to port a game much easier reusing parts of the code.
I can recommend redoing your game in Defold from scratch (some Lua logic can remain of course).