Launched my product, lost with marketing - I will not promote

So I've been developing a product for a while, it is in the weddings niche (Spain). Does the need of it exist? Yep, there are several competitors in the market that focus in the same pain I claim to solve (plus my wife and I had that pain during our wedding process). The product is solid, as someone who has walked on that ground I feel it is a good solution to couples. However, I'm lost with marketing. I'm a finance guy, can sleep like a baby if the stock market is down 30% because I know that theoretically