Just some simple tricks for car rental status.
You can get free Sixt Platinum status when you sign up with this link. Once you confirm your email address you can login and instantly get your card online that shows you as Platinum.
Then match that status to National and hopefully get Executive elite, possibly Executive.
https://status.emeraldclub.com/ (Can also apply here directly for executive)
Then email Hertz Simply enroll in the Hertz Gold Plus Rewards Program then provide proof of your identity and proof of status with other car rental companies via email to hertzstatusmatch
@hertz.com
And apply for Enterprise Platinum here.
Avis you can try via social media or calling sometimes.
Fell free to add more matches in the comments.
Thanks