As a developer, you're actually in a pretty common position. Many successful SaaS founders are excellent at building products but struggle with marketing at first. Before spending money on ads, I'd focus on validating that people actually need what you've built. Get a small group of users using...

"I've been trading for about 4 years. The first two years were mostly losses, but once I focused on risk management instead of profits, things improved."

Completely agree. User experience should always come first.