This page also does not load for me, though the end of the URL to view all products would usually be collections/all rather than just /collections. But brilliasboutique.eu/collections/all also does not seem to be loading! I can load every other page on the site though, so it is odd that this one URL is having problems. I’d like to walk you through some troubleshooting questions now to see if we can resolve this.
This may be related to your theme - can I ask if you have made any coding changes recently? If so, I’d recommend downloading a clean copy of the theme you are using to test if the page loads on an unedited version of your theme.
Are you using a lot of apps on your theme? It may be worthwhile disabling your apps and re-introducing them one by one so you can narrow down which one may be causing an issue.
If you try the above steps and you are still having trouble loading the page, the next step would be to reach out to our Support Advisors via chat/email so our Technical team can deep dive into this for you. We’re not able to provide account-specific support via the Shopify Community at this time, so visiting our Help Centre here will let you log in to your account and create a support request.