I mean this as constructive - reading through a lot of the website, it appears written by someone who is not a native English speaker/writer. There are many phrases and grammar oddities which feel/sound wrong or foreign as a native English reader, I highly recommend hiring a native speaker to rewrite your content in order to provide a better presentation.

Interestingly, if a website has multiple languages with a selector at the top, as a native speaker I am more forgiving "aha, they are German and this is just a English translation, OK" but when the only language presented is English (or German, or Vietnamese), it needs to be correct linguistically in that only language or it looks unprofessional.