Better: Try ROT13 on whole phrase:
thmyl → g s n b o? Let's do systematically: t (20) ↔ g (7) h (8) ↔ s (19) m (13) ↔ n (14) y (25) ↔ b (2) l (12) ↔ o (15) So thmyl → gsnbo (not English). thmyl brnamj zf awrj ly alkybwrd kn2000
So decryption: cipher -3:
Given the time, if I try a on the whole text: thmyl → oc hg ? Let's do properly: Better: Try ROT13 on whole phrase: thmyl → g s n b o
But check alkybwrd → could be alkybwrd = something ? thmyl brnamj zf awrj ly alkybwrd kn2000
thmyl brnamj zf awrj ly alkybwrd kn2000 ROT13 → guzly oean zw mejw ly nyxljoeq xa2000