You could always employ an 'expert' to create and moderate your altcoin's sub-reddit, but it'll be an empty wasteland, like much of Telegram with it's purchased bot followers.
So, plan carefully before you devote marketing budget for Reddit. If your message is appealing, it'll go viral regardless of whether you employ an expert or not. On the other hand, with bland fare, employing an expert is just like lipstick on a pig.
Experts can provide vanity metrics; but at the end of the day you are here to sell your coin, and that needs an entirely different set of tricks, ones that are organic in nature.