As subject goes, is Bitcoin the maximum version?
Is it still possible to develop it?
or
Can we still expect better coin than Bitcoin?
no, but bitcoin has improved a lot of technology since its birth 10 years ago, and if we look at some bitcoin developments that continue to the present such as Segwit, Lightning Network and innumerable new versions of bitcoin core software, then bitcoin is a continuation of growth entities sustainability and relative conservatism have provided stability and resilience that is not shared by other altcoins.
Bitcoin continues to develop technologically.