You could make aftermarket computer parts store into the forum... Either do dropship parts or have a sell forum where members can buy and sell their parts pay were listing or commission..
Get a fan base sell printful of TechLand gear on it. (their laptop cases are nice.)
It can be hard if your site isn't getting allot of a good amount of traffic and people joining. I have game keys and software valued over $500 on the marketplace and haven't sold anything yet LOL
Hmm... try to connect with e-commerce affiliate networks and promote some offers close to tech. It may be VPN services, antiviruses or something more serious like drones, phones, or something like that.