Here is a basic maintenance schedule for the Street 750. Harley folks tend to treat cable maintenance as an annual task.
Check out someone like cycle gear for cable lube kits if you don’t have a dedicated cycle shop in your local area.
If you plan on maintaining the bike yourself, see if you can get a service manual for your bike. Harley usually has them for $100 or less. They are not cheap, but it can be a lifesaver.
That’s my thought as well. Things like failing interior plastics, or glass that is no longer being manufactured, or basic body seals rotting away. Even body rotlike folks in cold or salty environments deal with.Those bits add up fast.