Considering bitcoin is just another currency, what can it offer that my local currency can't to improve the economy of the nation?
Very little, unfortunately.
Bitcoin is a currency, it can only do what currency can, and you can use it the same you use your own currency.
There is one advantage over traditional cash or digital, you don't need to be next to the guy in case of cash and you don't need a third party (as with digital).
From this, we have a better speed at sending money, not waiting for payments for days and so on, reaching people who don't have a bank account, dealing with fewer intermediaries, basically making the transfer of value fasters and with increased coverage.
But this is where it stops.
Bitcoin won't create jobs, won't create factories, will not make people smart, will not combat corruption, government's stupidity or anything.
And I won't agree with Lucius on this part
Perhaps the biggest influence of Bitcoin on some country is in fact that it create new jobs, mosty in exchange companies or people who do business with cryoto ATMs or anything similar.
Those jobs are jobs that get paid for a fee you pay, an intermediary just like the banks, if people stop dealing with the traditional fiat and switch to bitcoin entirely those jobs will be dead, just like they were when there was no bitcoin. When there will be no Naira, they will get on the unemployment lists.
I seriously doubt any 3rd party that you must pay to get a deal done is actually adding anything to the economy.
Let's see this example.
I must buy something from Tom for 10 000$, but I must use an intermediary.
I choose to buy less than 10k and pay the guy with the rest, so Tom gets fewer sales.
I choose to buy the exact 10k, I pay the guy a fee, Tom gets its sales, but I've just paid more so I will cut my expenses and John won't be able to sell me anything.
So rather than bringing value, it's more redistribution and is actually hurting the economy.
JUST like a poor coverage and high fees banking sector would.
Now, I would really want to hear from the OP some real data, no clickbait bs about real-life usage in Nigeria. People, shops, business and not only that they offer bitcoin payments, how many bitcoin payments are they getting!
Without that data is impossible to really measure if there is an impact.