100 sneak. 100 archery. Should I legendary?

I'm pretty much invincible. I can one hit kill everyone when I sneak. I'm invisible and can just go through an entire dungeon without being spotted.

When I sneak and use my bow, I deal insane damage because of the perks. It is actually quite satisfying, i love going through places and one shot killing everyone without ever engaging in combat.

But, I'm thinking of going further. I want to legendary one or both skills but I worried.

Is it worth returning to level 15 and losing my power worth it?