Well Tunisia aren't in EASA, yet, so you're in luck. You need to check with your CAA/DGCA to find out the procedures for conversion of qualifications. Unless there's been significant lobbying by any local schools, it should be a fairly straightforward and inexpensive process. That's the good news. The bad news is that 250 hours doesn't stand out so well on a CV these days and it's becoming increasingly difficult to find low hour jobs anywhere in the world, and even if you do find them, to get over the paperwork hurdle to work anywhere. From time to time, airlines do take on low hour people when they're experiencing a shortage, so make sure you check with all your local operators. I wish you luck.