The question "What if we ___?" is used to suggest doing something. When you say it in this way, it sounds like you're suggesting a new idea that you had. It also sounds like you're only suggesting one possible way of doing something, but you haven't decided that it's the best way yet. Some examples:
What if we offered a two-for-one deal?
You can also say "What if you...":
What if you tried applying for a job at a nursing home?