try looking at these guides or search the idea-catalog
https://forum.creative.gimkit.com/t/map-ideas-to-cure-your-boredom-reply-with-more-ideas/12678
https://forum.creative.gimkit.com/t/specific-map-ideas-to-build/17091
https://forum.creative.gimkit.com/t/some-super-easy-map-ideas-even-i-could-do/19333