なけりゃ => If not ... N2
Condition (hypothetical condition)
とりわけ => especially; above all ~ N3
Emphasis on degree
[事「こと」]だ => A is necessary/good (offering advice/suggestion) N3
Needs, Requirement
事と次第によって => Depending on the progress of the situation N2
How to say the beginning
ひとり ... だけでなく => not only…, not just… N2
Add
ていただけるとありがたい => I would really appreciate it if ... N3
Exclamatory
なりとも/せめて~だけでも => at least; even just a little (adverbial particle) N1
[事「こと」]ができる => Be able to A; can do A, Can A; be possible to A; N4
Causative, Passive, Volitional
につけ~につけ => each time, whenever, either way N2
…けれど => Explanation N3
Exclamatory
だけ => only; just N5
...かける => Impact N3
Act