Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

How can I make 7,000 rupees per day?

 It's not possible for me to provide specific advice on how to make 7,000 rupees per day without more information. Making that much money per day would depend on a variety of factors, including your experience, skills, and the current job market. However, one way to potentially make that much money would be to start a business or find a high-paying job that matches your qualifications. Alternatively, you could try investing in the stock market or other financial instruments to generate a passive income. It's important to note, however, that there are no guarantees when it comes to making money, and it's always important to carefully consider any financial decisions before taking action.