Just a trick that I’ve seen used – since you sell a specific niche line of product – I’d recommend creating reviews (youtube reviews, blog posts w/pictures, etc) about some products you think might sell well. Make sure to include the model number / brand of the products in the titles (good and bad reviews, on the bad ones you could recommend alternatives).
Then when people are searching for those products (by model number, etc), they may find a youtube review or a blog post that you made with more information that can link to your shop to purchase.