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I was thinking of getting a secured loan from Navy Federal. I have one from selflender.com but the rates were too high so I canceled it early.
https://www.navyfederal.org/products-services/loans/personal-loans/personal-loans.php#
The thing is I don't really understand what the ideal amount and time would be for credit score improvement. Any tips?
Getting an SSL is part of a broader technique, which involves paying almost all of it off at month 1 but then keeping it open for 60 months. You can read all about it here:
Just read the first two posts. Navy Fed is one of the proven alternatives to Alliant.