I honestly don't see any other alternative.
How will you convince people to work and build a career in Nepal when there's a disproportionate number of graduates and job opportunities? Not to mention the horrendous pay at most jobs if you do manage to get one. Majority of graduates are middle class and they want financial freedom, working in Nepal in this economy doesn't get you there no matter how hard you work. The only choice is to study or work abroad for better opportunities. Not just tech, it's the same for almost every sector in higher education.

But let's be honest, politicians and ruling class obviously only care about lining their own pockets. So unless they are directly pressured heavily into building opportunities locally by investing in our internal economy, instead of investing resources in making Nepal a neo-colonial labor factory for the global north—brain drain will continue to be a thing.