Niche refers to the role of organisms in the community. It includes what it eats, its behaviour, how it responds to the environment, and with the organizations in the community.
Humans do not have to stay in just one niche. They can adapt to any ecological conditions due to the development of Science and Technology.
I reside in a city, so my niche includes the biotic factors like birds, pet animals, domestic animals etc. surrounded by different plants. The abiotic factors include rain, strong wind, temperature, sunlight, mountains, rivers etc. therefore, every individual including me will have interaction with all the biotic and abiotic factors and adapt accordingly to survive in this environment.