I am playing KP for about 4 months. I didn't reroll and I didn't receive any SSR Kami when I created account. But I was participating in Events, gathering jevels and finally I won my SSR Kami's. So far I received 5, and only once I bought SSR Kami Gacha (Amon Unleashed). Other 4 (Dark Amaterasu, Ares, Nike Unleashed and Yamaraja) I received as different rewards, even from Single Premium Gacha (Dark Amaterasu, that was lucky ). If you didn't won any SSR Kami yet this doesn't mean You won't get them later. And in my opinion, with your current level it isn't worth to waste that progress (and bonuses).
Another "story". My brother joined KP over 2 months ago, didn't reroll too. Not so far ago he won his SSR Kami - the only one so far. But with his current level (68) he is strong enough to defeat bosses on Ultimate. As I wrote before, you really don't need SSR Kami now - I am sure You will get them later. You just need to be patient. And higher account level with some SR Kami and Legendary Souls are more important...