There have been successful (depending on your point of view) attempts of ridding languages of foreign influences. For example, Icelandic, which in the 19th cen

There have been successful (depending on your point of view) attempts of ridding languages of foreign influences. For example, Icelandic, which in the 19th century had speakers who worked on replacing Danish loanwords with Icelandic neologisms, and today a good amount of effort is put into coining Icelandic words rather than loaning English ones. Norwegian had something similar albeit with less success. There are two official written standards for Norwegian, Bokmål and Nynorsk. Bokmål retains more Danish influence, and reflects Norwegian dialects with more Danish influence (especially urban centres like Oslo), while Nynorsk is more 'pure' Norwegian, favouring more traditional grammar. Notably, the three gender system features more prominently in Nynorsk, where it is mandatory, as opposed to Bokmål, where the feminine can optionally be given masculine determiners, which is similar to how Swedish and Danish have collapsed the masculine/feminine genders into a single common gender. The movement for Nynorsk was also in the 19th century, powered by Norwegian nationalism, but only about 10-15% of Norwegians use it. Notably, though, in both cases the efforts to revert foreign influences on the language came from a grassroots, bottom-up approach, rather than a change from the top. And for the more successful case of Icelandic, well, linguistic reform is probably easier if only 300,000 people (probably much less a hundred years ago) speak it.