I think you are in the right direction -- the problem with perl is it's hard to find high-quality internet articles about it. There are many excellent articles about (picking a random example I care about) the borrow checker, or async, in Rust. There might be even better books, but the articles give me something to be inspired by and start investigating.

I think Perl's decline started 15-20 years ago, as that's when Perl 6 was "coming soon", and people didn't bother learning Perl 5 because of that. I can't remember ever seeing an interesting article about programming in Perl, either here or on Twitter.