What do you mean by miners are too centralized? and why do you assume that makes bitcoin no longer decentralized? You need to learn more about the concept of decentralization in Bitcoin, because you are thinking about the wrong concept about it.
Bitcoin will forever be decentralized and that will not change, because no one entity is managing the Bitcoin network as they please. Moreover, the issue regarding fees has nothing to do with miners, it is all related to Ordinal and the bullish market which makes the network congested.
I mean, ordinary people like me are difficult to become miners.
That's true. You need low electricity price and efficient ASIC in order to mine at profit.
The disk is 500 G, the Internet must be fast, and computer costs and electricity costs are high. These are the thresholds.
You don't have to run full node to use Bitcoin. And FWIW cost to run full node is far lower than running altcoin full node.
Therefore, in this world, Bitcoin has only 6,000 nodes. Most of them belong to one or two groups.
Actually it's about 16K[1] reachable nodes while number of all full nodes is higher[2]. And could you clarify by "one or two groups"?
Moreover, there is no trustworthy exchange place for Bitcoin's decentralized transactions. We must be KYC and become legal members. BUT KYC is not a part of decenralization.
Exchange isn't part of Bitcoin network. And there are several exchange with no or optional KYC[3].
And this forum. I just posted a post about Satoshi, which was deleted for no reason.
I didn't see your post, but this forum isn't part of Bitcoin network.
[1]
https://bitnodes.io/[2]
http://luke.dashjr.org/programs/bitcoin/files/charts/software.html[3]
https://kycnot.me/