There are several ways to make money online, but the amount you can earn in a short period of time like 7 days will depend on your skills, experience, and the amount of time you are willing to commit. Here are a few ideas:
Freelancing: You can offer your skills as a freelancer on platforms like Upwork or Fiverr.
Online surveys: You can take online surveys through websites like Survey Junkie or Swagbucks to earn money.
Selling items: You can sell items you no longer need on platforms like eBay or Amazon.
Online tutoring: You can teach a subject you are proficient in online through platforms like VIPKid or Chegg.
Online marketing: You can work as an affiliate marketer and promote products through your website or social media
It's important to keep in mind that making $300 in 7 days online will likely require a significant amount of effort and time on your part. Additionally, it's not guaranteed and you may or may not reach that goal