せいにする => Blame... N2
Cause, reason
姿を見せる => figure; appearance N3
Ability
させてあげる => (Allow) N4
Allow
てみせる => I'll show you ~ N4
Purpose, target
させてくれる => Let me... N4
Allow
...が...を...みせる => make it look like... N4
Base, base
~Vた + せつな => moment, instant, juncture N1
Beyond expectations
てみせる => To show (the action) A N1
Will, Decision, Doing
ようにみせる => to look; to seem; to appear ~ N4
Consider it
てみせる  => I’ll do my best; I'll definitely do; I'll show you N2
Determined, determined
ずにすませる => Get something done without doing A N1
Miscellaneous
なる => become N5