Its very hard and frustrating because EU doesn’t have the infrastructure to introduce/rotate products from country to country. It would be cool to have a shelf only with EU products in every Hyper/Super Market. Send cheese and champagne from France to Sweden one month, then rotate it to Poland. Poland send products to Spain or Romania, and so on. This way the supplier doesn’t have to increase production capacity to unrealistic levels, and they get some data on what people from different countries like.

Your economy will suffer no matter what, world is shifting away from US. Best thing to do is take care of yourselves and survive the economic storm that’s coming. After that, lead the way to normalize relations with former allies.