…からか/…せいか/…のか => perhaps because ~. N3
Cause, reason
... のだから => Because ... N4
Cause, reason
~てからというもの      => ever since ~ N1
…くらいの…しか…ない => Only… at low level N2
Limit, limit
…からいいようなものの => It’s a good thing that… this time… N1
Criticize
というのも…からだ => This is because… N2
Cause, reason
だから…のだ => No wonder... N2
Of course
くらいの => Approximate~ N3
Emphasis on degree
~のは…ぐらいのものだ => only (emphasis) N1
Limit
からある/からする/からの => at least; as much as; as many as ~ N1
いつかの ... => Previously N4
Time
のことだから => because; since ~ N2