To lighten up your wallet means to take out unnecessary cards and crap and make it thinner: https://www.google.com/search?q=%22lighten+up+your+wallet%22&client=firefox-b-1-d&sxsrf=ALiCzsaU2xM4x-Iiknknx-2DaI9qO9P2Mw%3A1668432405021&ei=FUJyY6Z4gJrBuQ-sqoHwBA&ved=0ahUKEwjm1tSG4637AhUATTABHSxVAE4Q4dUDCA8&uact=5&oq=%22lighten+up+your+wallet%22&gs_lcp=Cgxnd3Mtd2l6LXNlcnAQAzIICCEQwwQQoAEyCAghEMMEEKABMggIIRDDBBCgATIFCCEQqwIyBQghEKsCMgUIIRCrAjoICAAQogQQsAM6BggAEAcQHjoECAAQQzoECC4QQzoLCAAQgAQQsQMQgwE6BwguENQCEEM6BAguEAM6CAgAEAcQHhAKOgcIIxCxAhAnOgQIIxAnOgsILhCABBDHARCvAToLCC4QgAQQxwEQ0QM6CAgAEIAEELEDOgUILhCABDoFCAAQgAQ6BwgAEIAEEAo6CAgAEAgQBxAeOgwIABAIEAcQHhAPEAo6CggAEAgQBxAeEA9KBAhBGAFKBAhGGABQvBRYzzNgkDVoA3AAeACAAXWIAYAQkgEEMTMuOZgBAKABAcgBBMABAQ&sclient=gws-wiz-serp

Хорошо, убираю "потратить", но, похоже, это более общее выражение, чем "cards and crap"

"Well, the sports medicine industrial complex is happy to take this task off your shoulders and help you lighten up your wallet at the same time."

They’re using it in the same way, except that it’s humorous/sarcastic here:… and help you lighten up your wallet by relieving you of your money (as if it were taking up space like old credit cards and crap).