Got stuck in Oblate orbit of Kerbin after running low on Delta V on Mun mission.

[AverageScienceModePlayer]

After getting a Encounter with the Mun, i ruined it by not following my maneuver node on the Nav-ball and losing lots of delta V, and got an encounter with the mun at only 100 Delta V left, and any orbit maneuvers costed 300-ish delta V, Now i'm screwed with a 1680K periapsis, and 270,000M Apoapsis, so if anyone can find SOME way to help me, it would mean the world :)

[Vanamonde]

Well, if you wait long enough you are going to interact with Mun again. That might put you on a return trajectory. Or it might put you on an escape trajectory.  Or, you could wait until apoapsis, when burns will have the greatest effect, and have a kerbal get out and push the capsule with his/her suit RCS. You might be able to arrange a re-entry periapsis that way. 

Good luck.