Thmyl Bbjy Mwbayl Ly Alhatf -

That gives: guzly oowl zjnonl yl nyungs — not English.

thmyl → r gntk — not good.

Given the pattern, it might be a (each letter replaced by the one to its left on QWERTY). Let me test:

thmyl → guzly — still no.

Given the time, maybe it’s simply ROT13: t (20) → g (7) h (8) → u (21) m (13) → z (26) y (25) → l (12) l (12) → y (25)

On QWERTY: t → r (left one key) h → g m → n y → t l → k

But many such puzzles on forums use ROT13 for hiding spoilers. Let’s try ROT13 on the whole phrase: thmyl bbjy mwbayl ly alhatf

thmyl → guzly bbjy → oowl mwbayl → zjnonl ly → yl alhatf → nyungs

Given the ambiguity, the simplest guess: often used for hiding text, and alhatf ROT13 is nyungf → sounds like “nyungs” maybe a name. But none reads clearly as English. Could you confirm if the original language is English, or if it’s a known cipher type?

thmyl → gsnbo — no.

It looks like you’ve written a phrase in what appears to be a simple letter-substitution cipher (likely shifting each letter by a fixed amount in the alphabet).

t ↔ g h ↔ s m ↔ n y ↔ b l ↔ o

Let’s try (A↔Z, B↔Y, etc.):