"We chat" is just to combination of multiple apps. There are many apps with similar concepts like messenger apps. You hardly find any uniqueness in Skype, WhatsApp, Viber and signal etc. but all are successful and have billions of users. They all trying to solve same problem with similar solutions. The only difference you find is UI design and some minor things. Similarly, Udemy, LinkedIn learning, Lynda and Edx offers almost same services. Do we need to find problem or can we solve same problem which is being resolved by competitors?
Yes absolutely. All the companies you have mentioned solved a problem of the masses to be great companies. They were once just ideas but solving problems made them great ideas.
Focus on building a must have not a nice to have product. Attention spans are getting shorter in the age of multi-tasking and only few products are getting noticed – with many being a solution for a must not a want. You need to be doing something different and better to make it in this world, as donsumers expect and demand more than just another product. Solve real painful problems. If your product is not a must-have, you could still find a way to repurpose it to solve a pressing need. If you have been able to identify a crucial problem that you can effectively execute and deliver to market, you will be able to create a real business that matters. Your business should be your passion. Some entrepreneurs look to solve problems they identify with or feel passionate.
You can read more here: https://www.entrepreneur.com/article/236522
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath