So what can I do to modify all the threads for changes by Vehicle model year/name/Chassis code/Class/Importance role Star?
Just go slower when posting things on the site.
We can't follow, as you post too many things everyday.
Same when posting new vehicles, you include too many vehicles, not _everything_ is worth adding, the vehicles in far background / partially visible with no role can be skipped.
"Missed" comments can be posted there:
https://imcdb.opencommunity.be/index.ks?page=forum_topic&id=1987&index=0
But in your case the problem is not really they were missed, it is just that there are so many that admins can't follow, at some point they just have to ignore some stuff.
Especially if sometimes they find error when they check what you post : they can't trust blindly everything...
Same for me: I have a limited time daily for the site, so I already just have time to check the few links posted on the forum.