How to stop the urge from adding all the features out on the web on to your product?

To me it's all about focus! Add what really helps solving the need you're addressing, and nothing more :) Of course, beyond core features, there can be "nice-to-have"s, but I always keep in mind that every new feature added is an investment (sometimes a big one) and increases entropy in your product

Focus on your vision and your target group! What do you have in the plans and how will you get there? What will your target group benefit from on the way? Keep this in mind when adding features, otherwise, you will loose focus trying to implement features that your product might not need to be unique, successful and what you envisioned it to be!

have you ever heard of the Mom-test concept? I've been using it to make decisions about my product, and it's been really helpful! It's a great way to get honest feedback from someone who isn't personally invested in your product. you can gain valuable insights into what features are truly important to your target audience.