Given the structure, I’d guess this is a simple substitution. A plausible solution if ttbyq = quick ? q(16) in cipher = q? But t=19 for q? t=19, q=16, diff -3; next t=19, u=20, diff +1 — no.

For example, if you meant something like:

He realized that for years, he had been building "releases" for others while neglecting the most important "issue" of his own—his peace of mind. The app provided a simple bridge. Whether he was on a crowded train or sitting in a quiet office, the verses and reminders felt like a silent companion walking beside him.

Word lengths: 5 4 4 4 5 → plausible for English.