What should I Study

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Hi; I work as Supervisor in ISP Network Operation Center, I am very good at networking, have MCSE 2000, CCNA (Now expired), and a lot in experience in networking filed. Also, I have good experience at Managements filed, did a PMP training course and some other management course. I am an engineer and have MBA certification. Now I have a lot of free time and want to study something, however, I can't decided if I should go to study something related to networking like CCNP or something related to management like Project+ What should I do?