RehanZahir There’s not any room for another operating system besides the established ones, Palm did it and failed all that’s left of it is modern webos on LG TVs, Blackberry tried and failed, remnants of which today make QNX an automotive OS, Samsung tried and failed, only remnant is what their TVs run with tizen, Windows Phone has been dead for years, Amazon tried it they’re barely alive with FireOS only on their streaming sticks and their tablets even then FireOS is a shadow or what they had in mind for it with the fire phone.
There is no point nor is there an ecosystem of apps available for anything other than android or iOS, check any of the linux ports that are practically dead for all intents and purposes because of the lack of an app ecosystem.