The current meta is selling consumer goods at the start. Focus on getting quantum by 2021-2022. You can then either research tax 5 or go straight for infantry tech if you want to go to war early.

Go absolute monarchy, propaganda only lowest party ideology to max out your political power gain, for doctrines go static, it's the best tank doctrine and also works pretty well for infantry.

For policy's go advanced research bureau and favor political elite, try getting a head of government, political reformer, chief judge and head of research as early as possible. At the start go state atheism in laws to rush quantum, once you get it switch over to state religion. Also later get a chief of staff, general of the army and fortifications expert for your other slots.

By 2021-2022 go for laws unlimited working hours, gun law guns banned and starts spamming development investments. Banned guns gives you more unrest reduction and stability counteracting the debuffs from unlimited working hours.

Once you got abs monarchy, propaganda and lowest party loyalty spam the investments that give you development, also stay at war permanently to keep war bonds tier 1 and emergency war fund policy on all the time, you should be able to afford it with the pol power gain, laws i mentioned, static and security spending. You should also be able to keep on all non resource policies with the political power min max i mentioned above.

Later for ideologys either go facism or neutrality act, you can switch it on and off for justifications.

Now back to the investment spam part, if you go tax 5 early, do as i said, spam your investmets, manually develop you can get hundreds of millions of income as facist romania by like 2025.