How might architects help to achieve greater density in cities and at the same time maintain or improve the quality of life?

Informal Architecture

How can we apply the questions from other fields to architecture?
Are there questions that are situated only within the field of architecture?

How do architects help to achieve greater density in cities and at the same
time maintain or improve the quality of life?

How might architects help to achieve greater density in cities and
at the same time maintain or improve the quality of life?