If everything is there, and the only symptom you see is no past chat, you might review the account settings in the menu from clicking your user name.
The primary place for possibilities:
- Settings → Data controls → Chat history & training.
Setting the toggle to off gives you no past chats and no recording of them. Play with other toggles such as turning off betas, in case your account has become out-of-sync with new options available on accounts (such as those for making GPTs).
Secondly, not just a “clear cookies” but a full browser refresh can help get consistent software which runs in your browser. That is a key combination: Hold down Ctrl and click the Reload button. Or, Hold down Ctrl and press F5.
Then finally you can see if the symptom is still following you to a new login in a different desktop browser previously unused for ChatGPT, such as Firefox or Microsoft Edge.