I agree Gainsborough town centre needs to have something to attract people to linger longer than the dart to the bank.
A central point, for example a fountain, might be an idea, along with cafés with outside seating and little gift shops where you can browse
You have to create an atmosphere where people feel relaxed, then they spend money and the area will thrive.
The obvious needs to be put in place first, of course.
For example, cheap business rates for first year of trading and free parking for set time .
At the moment, though, Gainsborough is really missing a trick.
‘Marshall’s Yard Fan’