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Reach out to your contacts and let them know of your new address. You can setup a vacation message in Lehigh gmail to automatically respond with a message that you are no longer at Lehigh and what to do for anyone who sends you a message, which will respond as long as your account is active. Once it's closed the message will stop being sent.
Check your other online services (such as Twitter, Facebook, Amazon, Netflix, Pandora, your bank(s) or credit card(s), PayPal, LinkedIn) and change any account recovery addresses you may have setup with your lehigh.edu account to your personal email account.
You can transfer or takeout a copy of your g suite files, mail, calendar, etc. to another account that you own, such as a personal gmail account.
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Login to Mahara and setup a portfolio of your work
Graduating Students / Alumni
Graduating students can join https://mylehigh.lehigh.edu/ to stay connected to Lehigh with local alumni events. The signup also lets you create an alumni gmail account "@alum.lehigh.edu".
Retiring Faculty / Staff
Lehigh retiree's get to keep their Lehigh gmail account and access to Lehigh's network resources, but should transfer working files, documents, and meeting calendars to someone who is still employed. Most retiree's setup a vacation message so people sending work related messages will get a response informing them that they are no longer at Lehigh and who to contact.
Access to Banner and the I-drive (departmental shared space) is removed.
If a retiree no longer wishes to keep their account open, they can contact the Identity Management office and request it to be closed.