i presume jump distance is the problem? if you have a station or outpost you can dock at that has outfitting you will be able to extend your range a little by selling off items that both have weight and are not 100% required to fly the ship. empty your cargo hold, sell off any armaments like laser/multicannons etc, shields and as an absolute last resort consider swapping out your fuel tank for a smaller one.
selling that little lot should give you in the region of an extra 20% jump range and allow you to get back to more thickly populated space.