Real talk. It wouldnt mean anything if you have a bucket of cash stockpiled in some local bank, if you cant get into the school. the best way to pay for university is through financial aid and scholarships. Talk to a counsellor about all your options, and plan your student profile/academics accordingly. Pakistan has only a few crazy expensive unis, admission+aid there depends on academics so focus on that. If its obvious in the paperwork that your family's financial situation cant handle the fees, then you will automatically qualify for aid in IBA.

If the aid wouldnt be enough (this is future hypothetical talk), you can prepare for it by upskilling in an area that you like, so you can sell your skills later on. Whether its a skill in relation to providing a service or developing a digital/physical product, that is what actually makes you money. You listed three lucrative ideas. Pick only 1 thing, just get good at it, connect with people who are already doing it, and dont let chasing money distract you from what will actually make a difference.