It’s worth doing even if your country did, or if it is predicted to fail the threshold, as all signatures count towards the total goal of 1,000,000. However, seven countries also need to pass their threshold and only two (Germany, France) did so your support is most valuable if you’re from Denmark, Benelux, Italy, Spain, Slovenia or Sweden. Some percentage of the votes will be invalidated in the verification process so it’s better to aim for 125% of the threshold.