How do u get find good startup ideas in 2026 as all the gaps in sectors are already used up.(I will not promote)

I have a few questions and I would love for ur feedback. I am a college student from India trying to build and B2b saas for Us/uk clients . How do u in today's scenario find a good problem and it's solution if u don't have the method to go and find them out ur self . How do u guys validate, I mean yes there is cold emailing which I use for cold outreach (but I wanna know how u do it) How do u plan out and do the distribution for b2b saas. (As the mvp is mostly nowadays made by claude code ) How do u get the first few customers (as u have no case studies or referrals or people in the network) P.s: If u have any tips for me u can give them also .