Just do an airdrop and partner with shiller and influencer to promote it so that you can have a high chance of exposure. There's a lot of famous crypto influencer on twitter and news outlet like BSC news and Satoshi Street Bet that has already an established follower that supports all there promotions. So you can see immediately the result for the right price.
But if you insist on hiring a campaign manager here, You can try to contact @hhampuz, royse777 and yahoo, They are the current trusted bounty manager that I know that can do this job flawlessly. Prepare a significant amount of budget if you really want to attract a lot of participants to join on the campaign. There's a lot of active bounty campaign so competition is very tough if you have a tight budget.