As someone who has previously run several websites and struggled to keep them up to date I can understand your perspective on this and have a lot of sympathy. However as a site user I am deeply disappointed. As you acknowledge, there is nowhere else online that tries to create a central list of all the UK's major road schemes.
I seem to recall that in 2018 you suggested that the way Road Schemes operated might be changed so that the workload of coordinating updates was distributed among a number of (other) people, which would largely free you up to deal with other aspects of the site. What happened to that thought? Surely there are enough people with a vested interest in keeping this going that we could work together on this?