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.