I don't have much experience on the network/UC side of IT, but I can tell you that A+ is a certification for desktop/helpdesk people. If you want to get a network and/or UC role, it's probably not necessary. HOWEVER, it's much easier to get your foot in the door and gain some IT experience in an entry-level helpdesk position, so it could be valuable as the first step in your career change.
And early 30s is absolutely not too late for a career change.
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