If someone is trying to reinvent the wheel, they are trying to do something that has already been done successfully. Some of these ideas are worth pursuing, but there is no need to reinvent the wheel
To reinvent something means to change it so that it seems different and new. They have tried to reinvent their retail stores He was determined to reinvent himself as a poet and writer. + reinvention re·inven·tion a reinvention of the styles of the 1940s