For starters, you should price your game higher. One would think that would scare away buyers. But you do this to plan for large percentage sales in the future that might lure a lot of buyers. You also should not release your game on itch.io. Also seems counterintuitive. But hey. Got to listen to the pros.
You are gong to have to spend some money. Professional art for the cover and for in-game graphics are a must. Man. I guess novice pixelart does not go far in the professional game market. All right. Step 1: build game. Step 2: market game.