I don’t know how practical it is for your particular product, but I’d strongly encourage using reviewers or sponsorships over traditional ads. Ads will get you a very non-tech savy crowd, but most people with even a bare modicum of tech knowledge are going to be running ad blockers. So not only are you paying for bots to click your ad, depending on your product you might not even be reaching those that would even be interested in your product in the first place.