How will I benefit from an optical fibre connection if my broadband plan's bandwidth remains the same?

Although with fiber optic connectivity you should get better speed and data caps at the same price, let us assume, for the sake of the question, that you don't and try to see what benefits optical fiber can bring you.

Fiber optic connectivity will maintain service level standards for decades. The technology is mature and so capable that we don't have machines that can process their highest speeds. Fiber optic cables once installed are not going to go anywhere. Advancements in modulation techniques can be applied on the same cable without replacing them. Unless people are careless with installations (like digging where they are installed) fiber optics are here to stay.

Given that fiber optic technology is operational for decades once installed year on year the price of running such a network will decrease. Companies can pass on the savings to the consumers or bring more people online by investing the savings.

Because the internet is highly reliant on network effects you'll get to enjoy more services cheaper or free of cost. UPI has been successful only because it is supported by a terrific network infrastructure. As I write this answer higher technical education is mostly free due to NPTEL videos . And I'm not talking about elementary courses. I'm talking about electronics,nanotech,mechanical,electrical, and aerospace engg. People from.world over will not have to spend so much money on education. It is free for all [1]

Fiber to the home is only one way to consume the internet. Fiber will also help you get high speed wifi and cellular services. If you add all these together, the total bandwidth that is being consumed would not have been possible without fiber. Next you can expect governmental services as well as more private services to be available on the network.

Speed is overrated. Once a certain threshold is reached, efforts should be spent on maintaining it rather than going for faster internet. Better to have more people on the network at uniform speeds than to have more speed for the same number of people.

[1]https://m.youtube.com/user/nptelhrd/channels

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Unlocking the Potential of Carbon for Long-Distance Electrical Transmission

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Notes by Akshat Jiwan Sharma

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