It's been a long time since I have played vanilla. TBH, going to at least For The Motherland is highly recommended. But, of course, that is your choice.
With the little caveat that things may be different from FTM and TFH, the best strategy for Romania, would be to unite the Balkans: Hungary, Bulgaria, Yugoslavia. Probably in that order. If you can do that before 1938, you could target either Austria or Czechoslovakia. Or you might want to grab Austria first, so that you can attack Yugoslavia from another angle. I did that once, in TFH, and annexed Asutria, but I was too slow to grab the Czechs before Germany got their hands on the Sudetenland.
If you do get the rest of the country, you will be just short of 100 IC. Slow down, build some factories, trade to get relations up with Germany, France, UK and Russia, because this gives you really big amounts of threat.
Turtle for a while and let your Mp recover. I'm not sure if going for Turkey right away is a smart move or not. And you will probably still lose Bessarabia to the Soviets. Not much you can do about that, I think.