I think that unless your main issue with your first island is the placement of resident services you should keep it.Okay this is something that I've been wondering with my old island. I made my 2nd island in a design that I've felt really proud about, but for some reason when I compare my 2nd island to my main island I just feel like I put too much effort into it. I mean I was trying to make changes on the main island, but the ideas that I wanted on that island is not fitting well with what I came up on my 2nd island. So now I am wondering do I restart the old island so I can make a different layout that is almost like Twilight? I know that I can carry all of my items over from the old island to the new island, but I am not sure.
I know I said in the past that I wanted to keep my main island, but after getting the 2nd island and designing it I feel more happy with that one, but the old island I have I just don't know. This is like comparing "old vs new" at this point. Its a weird thing to ask. I feel stuck.
Old Island:
View attachment 376598
New Island (2nd Island)
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Even if you flattened it, you'd still be in a better position than if you restarted it.
You'd lose all of the work you've done over thousands of hours and I'm just not sure its worth it.
I would see this as an opportunity to play your first island again. Take it piece by piece. If you make an area you like, keep it. Move to the areas that surround it and try to make them blend into it.
Also, since you have a new island going already, you might find yourself overwhelmed if you tried to have a second one thats also at the very start.
Thats just how I'd look at it