I studied German around 3000 years ago and Dutch feels somewhat more intelligible to me (at least when reading it, heh) compared to Estonian; it really does sound like someone took English and German and made them do unspeakable things to each other. German & Dutch definitely are a good enough comparison in any case, and I guess eg. Spanish, Portuguese, Italian and maybe Romanian might be too.
But even eg. Italian and German are related, even though it’s not immediately obvious. You Indo-European speakers are surrounded by related languages, and here’s us, the Estonians, the Sámi and a bunch of dying minority cultures in Russia speaking our crazy moon speaks that nobody understands.