Germany obtains 45% of their gas needs from Norway, the Netherlands and other sources. Right off the bat, this is enough for domestic use and heating, even if no cuts are made.
The largest concern is industrial use. Some industries use gas exlusively and can’t even significantly reduce their use. Glass industry is a perfect example, you melt glass in furnaces that are operated 24/7, if they’re allowed to cool down they’re no longer usable. A number of industries require gas to operate and this is the major headache of Germany - how will they remain competitive and open, in the face of high gas prices? Yes, the problem is high price, not lack supply.