@Harry336 assuming you're not looking to invest an arm and a leg to open up the space - I'd take a look at Facebook Marketplace to get ideas on how you can fill the space inexpensively. a games room could be a good idea because people are often trying to get rid of pool tables for cheap or free - same with workout equipment if you wanted to turn it into a little gym by adding a bench press and some mirrors or something. depending on how large the space is, you could even do both.