After the mining of 21 million bitcoins, what will be incentive for the people who take part in the blockchain network, also called miners?

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Ever wondered why you're paying fees for bitcoin transactions? It's because the mining rewards are not enough for them.
So after the 21 million bitcoins are mined, the fees will be what pays the miners.
Well right now miners are making a ton of money on transaction fees, due to network congestion. These problems are being fixed and will lower the fees. So its possible that in the far future of 2100 when the last bitcoins are being mined that these fees could increase corresponding to block rewards. So that miners will run nodes purely to confirm transactions and collect the higher fees from them.