For you I think it is spreadsheet time.
Many shoppers maintain a list of companies. Information can include
When you first heard of them,
How you heard of them,
Did you sign up/apply,
Did they approve your application,
Username & password,
Notes - any thing relevant such as why you did not apply.
In my 6 years of doing this, my spreadsheet has often saved me re-researching companies that I have had contact with before and forgotten about. Especially when it reminded me of why I did not apply.
Good luck.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut