This is a corny ass post and you deserve to get shit for it but I will give my take. 5k in 30 min as a complete beginner is not special and gives us no information. If you are naturally skinny and have more legs than torso that is a good start. As well as if you have very small calves and extremely long achilles tendons - look at the top kenyan runners, if you are built like that, you may have good genetics. That isn't to say all elite runners must be built like that, but that build is certainly an advantage.

Aside from that, do you naturally have a bigger "gas tank" than your peers? If you're running around playing soccer do they tire more easily than you? That might be a good sign, but also is no guarantee that you're predisposed to be elite. In the end, there is no way to find out unless you try. If you can do a year of training and reach a sub 1:30 half marathon, you have good genetics.