In my opinion, it creates a big problem for EU. If Russia cannot sell gas for EU, they will earn less money but they still sell it, for example, Asia nations. In the side of EU, they are meeting the seriously scarcity of gas and food. They choose to decrease the gas in the WINTER.
In what way did the EU choose to reduce gas in winter? because gas has become a staple now even though it can still be tricked not to use it, but some people are also lazy if they have to replace gas with other materials for their every need. Basically all countries need gas and if the EU no longer accepts gas sales from the Russian side, then the Russian side can still market it to other continents besides Europe. Because gas will not be a waste as long as everyone still really needs it in everyday life.
Gas is a commodity and the more it takes without demand the more it could loses it value if demand keeps reducing. Russia is going to be affected big time which is one of the thing NATO had been waiting for so that Russia will not have the fund to spend on military equipment to keep attacking Ukraine which is part of NATO countries.
If you think Russia will have other options to market it gas supply then I think you are wrong because what direction do you think Russia will face now when it biggest market is in Europe. Russia can not turn to Africa because Africa does not mostly depend on gas and there are many Africa countries that has there own natural gases like countries like South Africa, Nigeria etc that has market too all around the world.