Code. Write lots of code.

• Write code for fun.
• Write code at work.
• Help others write code by answering questions here at the Monastery and other Perl forums (already mentioned by wind).
• Write code to fix bugs of your favorite CPAN modules.
• Write code to test your favorite CPAN modules: How You (Yes You!) Can Get Involved
• Getting Involved with Perl 6 - 2010
• perlcommunity
• http://www.perl.org/community.html

You're bound to connect and improve.