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Welcome to the Zoom Community, @Umarjon.

If you have an account with 10 or more licensed users, each licensed user has a meeting capacity of 300. 

If you are a Pro account (less than 10 Licensed users), you need to add a Large Meeting add-on. See this Zoom Support article for details:

https://support.zoom.us/hc/en-us/articles/201362823-Hosting-Large-Meetings

Note that if you currently have a Basic (free) account, you’ll first need to get a Zoom One license and assign it to your Zoom user login.