Bitcoin is not at all a narrow topic lol. There are many points you can cover such as:
Decentralization.
Inflation rate.
How it led to creation of altcoins.
Working process of bitcoin and about its ledger system.
That major points was already discussed by other users here maybe we should suggest another unique features and topics about bitcoin.
Altcoins: As bitcoin is the most widely used cryptocurrency, these altcoins are really an alternative source of profit in them market if bitcoin doesn't have any movement in its price.
But still always prioritize your bitcoin as it really matters the most compared to other coins.
6. Conclude with how it can be a very useful tool for the current and coming generation and how it can totally change the way of economic.
I like this idea. This is so true, on time, and of course futuristic. Make this as a highlight at the end part of your essay. Most of us now depends on online now and for sure they will like this new idea if they would read this kind of thing. But of course, you have to include that bitcoin is risky. It is not just simple as they may think it is.
In the introduction of your essay, you should tell them that bitcoin is risky so that they will not be worried at the ending of your essay. Tell them the advantages and disadvantage of bitcoin in the present and especially in the future so that they can make plans and they will have foresight to become prepared about the future of bitcoin.