I must not be alone with this problem and look for ideas.
I post a lot of research in this (great) Forum and this year marks my 13th anniversary!
Several times I asked how to effectively save long threads to keep track of the research and discussion and could only partially succeed (page by page as print PDF on my PC vs. say printing the full thread with all its pages in once).
Now I have a related problem as, when I was searching for a post I recollect very well I wrote, I was not able to find it as older than one year. Apparently after consulting with experts I was told they had the same problems. They too could only track about one year old posts and topics of theirs. While I keep bugging them, hoping for a solution, I wonder about other users. I also fully realize the resource limitation of the Forum.
Have you gone to the same pain and found a solution? Are these features only for paying users? I am sure solving both issues will improve the Forum and provide incentive for growing the community.