I will not promote. Where do I start?

Hi there, I want to know your opinion on how you would approach this situation and if you would take advantage. Also, not sure where to begin. To give a long story short, I got an LED beer sign as a gift a couple years ago. It had a sticker logo, was on an acrylic cut out and you can change the brightness. It was 16” x 20” However, it definitely did not look professionally crafted when you got close to it. The logo was very pixelated. I decided to post it on Facebook in my area, for $60. It got 5,000 views and had 108 messages in the matter of 3 days. 1 person came to buy it but refused, because they thought it was a real neon sign. So, I took it down. Waited a week. And reposted it for $120. Again, 35 messages within 2 days. I eventually sold it for $120. Now I am sitting here, thinking I might be sitting on a gold mine. Where would you start?