@Qurks , of course your performance during the first years of being hired at a job matter. That is a given. But in addition to this, it is important to maintain relations with those within your profession to develop a network, as a way of finding out about new opportunities and selling/marketing yourself.
You ask how to form a network? Many ways -- Meetups, LinkedIn, industry-sponsored events (you're wrong that industry rarely sponsors anything -- haven't you heard of IEEE?), through professors with ties to industry (you'r wrong they only provide connections to PhD students -- I finished my Masters and got a job through connections at my university).
Non-work based clubs is another good way to meet people -- one of the people who used to post here got her job after networking with someone she met while working as a bartender during the height of the financial crisis between 2008-2010. Also, here at Physics Forums is another way to network.
[As an aside, you sound awfully familiar to someone else who used to post here at PF.]