While libtool has a new maintainer (Alex Ameen), essentially nothing happens, which is quite unfortunate...
1) libtool 2.4.7 was released in March 2022 (I don't know if Alex did it), which isn't so terribly long ago. Sure, maintainers should at least confirm bug reports and patches, even if releases don't happen quickly (pace my own efforts with automake), but ... 2) When a package appears to be unmaintained, the first thing to do is simply write the maintainer to see what the story is. If there is no response, the next step is to write maintain...@gnu.org. It's their responsibility to make continued efforts to contact the maintainer, up to and including sending paper mail. And look for a new maintainer if need be. 3) If that also fails, the final fallback is to write gnu-advis...@gnu.org and/or r...@gnu.org. Best, Karl