The typical methods of language reform are simplification and linguistic purism.
For example, in English, there are many prefixes which mean "the opposite of", e.g. un-, in-, a(n)-, dis-, and de-.
A language reform might propose to replace the redundant prefixes with one, such as un-.
Linguistic purism or linguistic protectionism is the prescriptive practice of recognising one form of a language as purer or of intrinsically higher quality than others.
The perceived or actual decline may take the form of change of vocabulary, syncretism of grammatical elements, or loanwords, and in this case, the form of a language reform.