I think it’s slightly off-topic but I haven’t been maintaining any of the Kowainik packages for more than a year and I don’t have plans to return to their maintenance. You should contact current maintainers if you want to offer support and maintenance help.
On a non-off-topic subject, since almost all Haskell packages are maintained by volunteers in their free time for free, it’s unfortunately quite common when people completely stop maintaining Haskell packages with no one to step in. Besides, often it’s impossible to use an older package if it hasn’t been maintained for a while.
Some people stop maintaining Haskell packages party because maintenance requires too much churn (myself included).