One of these ideas.
An afternoon tea cafe that didn't cost the earth per person. Scone, traybake of choice and sandwich selection as your basic tea for two. Then going up in price with a high tea if the same with a meat/cheese board added etc. the shop would also sell cakes to take away and delivery options for Easter/Christmas etc.
A keto restaurant. Canteen style so you can mix and match your protein to veg and there would be a salad bar and some simple desserts (e.g. strawberries and cream). Includes takeaway options and a catering service.
A local gallery/art/craft shop. The walls would be full of art (no white space) for a very small fee from the artist. The back half of the shop would be a communal crafting area with big tables where workshops can run or to be used for craft meetings. Walls lined with a rainbow of materials that can be bought for a members discount etc.
A design studio. Get student interns in for one year. The studio buys derelict buildings/plots and uses them as live projects, sells for profit.
A play/cafe. Big piece of land. Awesome bespoke playground. Big chunk undercover for rainey days. Water stream, sand, mini world play etc. there would be a sensory play corner with lights etc. The attached cafe wraps around the play area for full visibility but also sells actually decent food. Salads, home made stuff etc, not just beige stuff.
Tbh if I win the lottery and money was no object I'd quite like to do lots of these anyway with no expectation of making profit.