I am operating Tor relay as an exit on 10 MegaBytes/s speed network. But when checking from http://atlas.torproject.org, it shows only 700KBps Advertised Bandwidth. How to increase this bandwidth?
Advertised bandwidth as reported by atlas and globe is really what is observed as of far. Your relay has only been up for four days, and as your relay proves its reliability and speed, advertised bandwidth will go up.