Besides maybe some other factors, the trending badge does come with increased traffic. There is traffic that leads to sales (good traffic) and traffic that leads to no sales because people are not looking for your product but are clicking on your item because they thought it is something different, were clickbaited or whatever.
Getting bad traffic is easier as getting good traffic, because you don’t have to target your audience. At the same time, it does not convert into sales as much (or at all).
Trending badge may help you with getting targeted, good traffic as your item may rank higher, but as we don’t know what factors trigger the trending badge, you may end up loosing search ranks because of the high bounce and exit rates on your item because of your low targeted traffic that tells the algorithm your item is not good (or why else is everyone looking at it and not buying it?).
What you really want is increase your sales. Try to do that. Trending badge will come when you succeed with that. Trending badge may come also when you do something else, but why not do it right the first time and spend your time on something you actually want to achieve, than in something you think will help you with achieving it?