Why are several indigenous languages becoming EXTINT from the World ??

Image Source: Pexels .com : Amfisa Eremina

Historically, most languages spoken in the medieval era has become exinct , only existing in archives and museums of antiquities.

The trend is likely to persist if not controlled by direct intervention.

What could be the immediate and intrinsic cause of this phenomenon??

What are your remedial recommendations to halt more languages from going into extinction??