Hi, I have much the same problem. I opened my stargazer wallet in 2017 and only had/have a password and my public address. I am meticulous about keeping records of secret keys, etc., but I do not have any such information for this wallet.
I, too, had to reset my computer, had the stargazer wallet on a portable drive, etc., etc., but have not been able to restore to retrieve my Lumens.
If you have found a way to restore your wallet since you posted, please let me know. And if anyone else has any suggestions, please reply. All suggestions will be greatly appreciated.