I checked out your countries. Here are a few things I noticed.
Set your country ordering supplies to 120. You are ordering too high quality for countries. This will cut costs drastically. Set your state corporation salaries to 200. This is optimal for max profit. Set your state corps to order 215 quality supply. Some of your corps are buying extremely high quality supply that is going to waste.
You also need to diversify corps now more than ever. C3s react very quickly to market shortages and push products back into surplus very fast. If you are too heavy in one sector, which it seems you are in services, you will get destroyed.
Also drop your health and transport indexes to 130. That is the highest you need to maximize welfare index. Anything more than that is not worth the cost/benefit ratio.
Your social security payments are way too high. Your percentage is right, but you need to boost your employment. You have a massive population with 87% employment. You are losing 85B per month in social security costs. Build more corps. I recommend computers, software, road maintenance, train maintenance, and water maintenance to diversify what you already have.
And one last thing. Your secure mode country should not be burning 50B per month on defense. That is crazy. Move all of your weapons out. You should only have 150 forts and some bases, which costs around 4B per month. Move your weapons to your slave countries that can actually be attacked, or better yet put them in your CEO and only mobilize when you need to go to war. Keep a token air defense in all of your slaves to protect against sneak attacks. War declarations take 10 months to start, so that is enough time to move weapons in via space and reactivate them.