Several years ago, I manufactured product and stumbled upon a website called RangeMe. I assume there are others like it.
With this platform, I could post my products and their wholesale cost and margins.
Then, retailers and distributors could see my products and choose whether or not to engage with my brand.
I'm sure the process has changed a little since I last used it in 2017, but it was very helpful for my in finding new wholesale accounts.
@Stuart Briscar is right: RangeMe handles this function well. Its parent company, ECRM, also hosts what they call EPPS (Efficient Program Planning Sessions) trade shows, but which are really speed dating sessions with retail buyers.
There have been some others who have tried similar concepts, but the big impediment for a new player is getting a large enough audience on both the buying and selling sides. ECRM has been doing this long enough that they have a significant head start in amassing an audience.