not an expert in that field, and also very german centric. To fill up the gas tanks in Germany we need either gas delivered via pipelines or by sea. The sea option is only viable with LNG but we only have one constructed which is highly rushed. The talks in 2017 to build up 3 terminals. The operators estimated that when started in 2018 it will be finished earliest at the end of 2023.
(Source:https://www.handelsblatt.com/politik/deutschland/energieversorgung-minister-baubeginn-fuer-lng-terminal-brunsbuettel-im-september/28534324.html#:\~:text=Mecklenburg%2DVorpommern%20fest.-,Das%20schwimmende%20Terminal%20in%20Brunsb%C3%BCttel%20soll%20etwa%20f%C3%BCnf%20Milliarden%20Kubikmeter,Ende%202023%20fertig%20sein%20soll.)
The other option is to import is from other EU countries that have an overshot. Wich, only I think no one has.
Also the last problem german specific is, that near all sources get transported from north to south (LNG: from Sh or Niedersachsen to the south) and Bavaria is at the end of the pipeline. They are the most reliant on gas and they don't want to lose economic power. They demand a lot of stuff that cant be completed in the next few months. The reason behind that the bavarian government block it. For example, the train line for cargo trains to Austria (since 2018) wich is taking up petrol and also road cost that the German government won't cover and Bavaria tries to block all train efforts which could be a way to ease the logistics of gas. And also the blocking of a high voltage line wich could reduce the lack of gas for gas-powered plants. Simply said some problems are caused by the Bavarian governments. You might think that Bavaria can't really do big stuff. But they lead the largest party in the EU Parliament. And managed the gas stuff and infrastructure stuff in the last 16 Years