I have to say that for the first couple of months here in Berlin we also used Lieferando a lot. We were pretty dissapointed with everything we tried with the exception of YogiHaus curries but even that isnt a patch on SA. That being said we have discovered some great places to eat. Yes the beef is not great but you CAN get good beef and if you do then for love of all that is holy, cook it yourself, at home.
In general i think German food is boring. Sure I havent been here for 12 years like you have but hey...at least we have electricity here I suppose. Hell you can eve get decent biltong from
https://biltongfritze.de/ in fact he makes some good boerewors too. But can take some time to get the stuff.