Also, I just tried your save file. And although I don't know what your DLCs are in this save, I've added all of the main expansions, but if you want to play this save file again, it's going to be without ironman.
It took me about an hour, but it's totally possible to save this game. You started in 1503 and I ended it in 1509. I've attached
this video if you want to see how I saved it.
A breakdown of what you should look for:
- Spend your Papal points! You had the maximum 200 just laying around. Never let it reach 200. Catholicism got buffed, so I would recommend taking morale, national tax, manpower.
- Your idea set is kind of weird. Exploration and Offensive. Usually if you're going to go colonial, you want expansion with exploration. Offensive is an all around good military idea group but France absolutely does not need military ideas early game, in-fact it doesn't need any. Though for novice players, I'd recommend you do take one, and probably either defensive/quantity.
- Keep an eye on your war exhaustion. Nearing +10 and having a lack of diplomatic mama is never good. Thankfully you were surprisingly stable with +3 stability.
- Pretender rebels break PU's. Scotland had a 20k pretender stack while you had next to no troops in France. Luckily Scotland managed it themselves but the AI might not be able to handle it in a different playthrough.
- Force PU'ing Burgundy is very, very nasty. Especially if they've expanded more. It took 89.0 AE!! To PU them. I had to improve relationship with so many German minors that micromanaging them is going to be hell for novice players. Make sure you almost always take the splendor bonus for -10% AE. Keep prestige high too.
- Exploit development. Your manpower and troop numbers are so dire that it would help so much. Not sure if you have the DLC for this.
- Hire merc units immediately. (There's one with 3 siege) It also helps that once you exploit development, you get cannons. Again; Dependant on DLC?
- Siege back Haut-Poitou immediately. There's only 400 garrison in there.
- Get a level one admin and diplo advisor. Your military advisor is fine considering the circumstances, but if he dies try to get a morale advisor.
- Estate management; This looks to be a lacking area. Estates are made to be abused. Get monarch power from all the estates.
- Shift consolidate your troops. Very important to win battles and stackwipes.
- Remove all your edicts. If an enemy is sieging a province, put the defensive edict on.
- Alencon vassal has 'No Religion'? Probably a bug from my end.
- Royal Marry all available vassals.
- Increase autonomy in Burgos/Asturias to prevent rebellions.
- Don't be afraid to take loans. You didn't even have one at the start of the save.
- Your ally, Papal State will eventually peace out. He will help in your war in the meantime.
The actual war itself is not easy. But Burgundy is effectively out of manpower, their allies are weak. Eventually a couple years in you can get your boats over to their ports and block them, then immediately peace them out. Battles should be selected opportunistically, sieges should be done at the right time, capital fort needs unsieging as soon as you can. I can't really explain how you do battles here very well, you'll just learn in time.
Next steps from the save I did? Relax a little, integrate your vassals. Improve with Burgundy to +0 opinion. If your king dies before you get to that threshold, you'll lose the PU. It's RNG and yes, it's very frustrating. Let your manpower recover; And keep improving with German minors. There are so many countries that can join a coalition against you if you don't keep them above zero; I did for your sake, but maintain it. Five countries (including Austria) can join right now, but hopefully all your vassals/PU strength outweigh it forming.