Kampywtr | Danlwd Mwwy Jwan Bray

d (4) → q (17) — not promising yet. Let’s check quickly:

So maybe not ROT13. Given the phrase shape, maybe it's (a→f): danlwd mwwy jwan bray kampywtr

d→q, a→n, n→a, l→y, w→j, d→q → qnayjq — no. d (4) → q (17) — not promising yet

It looks like you’ve written a phrase in (each letter is shifted or replaced). maybe it's (a→f): d→q

Maybe not ROT13. d→i, a→f, n→s, l→q, w→b, d→i → ifsqbi — no. Step 5 — Try ROT-5 (shift 21, same as ROT5 backward) d→y, a→v, n→i, l→g, w→r, d→y → yvigry — no. Step 6 — Try ROT11 d→o, a→l, n→y, l→w, w→h, d→o → olywho — maybe? “only who”? Not quite.