Any 650W 80% Gold, Seasonic has some semi modular PSUs, that fulfill this specification and are not too expensive.
I'd buy 750W or even more, to be future proof. There are no Seasonic PSUs listed on Amazon India website. WTF.
This should be okay:
https://www.amazon.in/ASUS-Axial-tech-Protective-Military-Grade-Certification/dp/B0BK54TKB9/ if it's not fake.
Or this one -
https://www.amazon.in/MSI-MAG-A750GL-PCIE5-Full-Bridge/dp/B0C7LKLSMD/ - but is way cheaper than ASUS.
Either one will be significant upgrade from your current PSU, quality-wise, efficiency-wise and loudness-wise.
As for your GPU, it's been suffering high temps quite a long time ... I'd replace it as well soon.