I am one of your most devoted users, if counting hours spent with GPT is a criteria.
I want to offer a feature that is easy to implement on FE, but that would be useful especially given the problem of context window saturation in long conversations.
Use cases:
– User wants to save the “spirit” of conversation, but conversation is long and it starts to lose attention points.
– User wants to focus on a spin-off topic from a given point of conversation without derailing the main conversation course.
What to do?
In UI context of each GPT reply add an icon “New conversation from here”, which will clone the conversation under different name. That’s it 
Now user can either use last reply or scroll up to the point where he wanted to branch out.