ひとり ... だけでなく => not only…, not just… N2
Add
ひとつ => A little N3
Repetition, habit
~ひいては => by extension N1
Add
なんとなく => for some reason, somehow N3
Vague
ぜひ => by all means; certainly; definitely ~ N5
ひじょうに => very; extremely; exceedingly N3
Description
…ひとつも…ない => cannot possibly be ~ N2
Evaluate
もうひとつ…ない => (not) anymore N2
Description
... ひとつ…ない => nothing/not at all… N2
Emphasize the negative meaning
くださいませんか => Could(Would) you please N4
…ときたひには => when it comes to N2
Story topic
ひとつまちがえば => Just (negligence) N3
Ability