I've just stumbled upon your quest to save an aging amusement park. I'm from the US and have personally experienced the closing of three wonderful "smaller" amusement parks in my life.
All of these had fabulous wooden rollercoasters not unlike the ones I've seen pictured at your park.
It seems that all the parks here in the US are turning into MEGA parks. In doing this they lose that charm of a family business.
My favorite park from my childhood was a series of amusement piers on the Atlantic Seashore at Wildwood, New Jersey. When I was young there were 5 piers which were built toward the ocean from the main boardwalk. Each pier was a small amusement park and all were individually owned. Each one had a personality and vibe of it's own. I worked as a DJ/Ride operator for the Himalaya ride on Mariners Landing Amusement Pier for two seasons.
Recently, the largest of the 5 has purchased all the others and now tickets are universal between them. However, they have lost something in this. Hard to explain, but it isn't the same.
All this to say,... Keep up your efforts! Save the park! Buy the park! Do some market research and find out what it would take to make the park a viable year-round location to improve income. I have tons of suggestions but I really don't know the status of your situation.
Thanks for reading!