If you could made 250 euro deposit one time and lose everything, so make depo once again and just try play smart with in your level.
250 euro...hm... you know, even 50$ is very nice to play 6+ tables in NL2 comfortable and profitable. 100$ is good enough to play buy-in MTT (for example for this money you can play 9 Sunday Storm). Indeed you have 100$ in reserve!!!
Very interesting how you lose 250 euro? Maybe playing BIG LIMIT cash games? So make the conclusion and refine your game (for example change cash level to micros).