I've had that feeling sometimes. TBH... the best thing I've done is happen upon other islands that make me feel better about mine BUT that's usually happenstance and it all comes down to preferences anyway.
Sometimes it helps to just stick to your island for a bit, though, and remember what it is you love about it. You could also consider looking at what you like about those other islands and trying to figure out what aspects you could incorporate into yours. Sometimes when I think about how I'd like to change my island to make it more similar to the islands I think are cool, I also realize that some of those islands LOOK awesome... but would be super inconvenient to actually play on. I like how my island looks AND it's super easy to navigate- which means I can fully enjoy it when I play by myself, which is usually what I do!
I also choose to view my island as dynamic- meaning, if I change my mind about the current design, I can always change it whenever I want. This takes off the pressure of "finishing" it and helps prevent me from getting bored with what I have! If I'm feeling bored, I just change things up.
Sometimes it helps to just stick to your island for a bit, though, and remember what it is you love about it. You could also consider looking at what you like about those other islands and trying to figure out what aspects you could incorporate into yours. Sometimes when I think about how I'd like to change my island to make it more similar to the islands I think are cool, I also realize that some of those islands LOOK awesome... but would be super inconvenient to actually play on. I like how my island looks AND it's super easy to navigate- which means I can fully enjoy it when I play by myself, which is usually what I do!
I also choose to view my island as dynamic- meaning, if I change my mind about the current design, I can always change it whenever I want. This takes off the pressure of "finishing" it and helps prevent me from getting bored with what I have! If I'm feeling bored, I just change things up.