Six years ago I thought the Telekom technician connected 2 DSL sockets. Now I wanted to relocate the Fritz box and wondered why there was no internet.
I will try an interpretation of your extremely fragmentary description: six years ago you got DSL, before that there was presumably an analog telephone connection. This was implemented as a socket system (with TAE jacks; if you use the second socket, the first one is deactivated). This construction was regularly disabled when ISDN, DSL, or both were installed, because that does not work with a socket system. By the way, in almost thirty years of telecom I have never seen a "DSL socket."
You can connect that yourself. You only need a small flathead screwdriver. Instructions are available on the internet.
I will skip the excursus on the LSA tool here. As a customer, you
are not allowed to connect anything yourself—neither on your own nor as an instigator of an electrician. After the distribution point, the last mile continues up to the "first TAE." Only at its socket does your sovereignty over the network actually begin.