Looking just at Costa Espada, though you could repeat these steps elsewhere.
The place to start is maximizing your welfare index for the least cost. Some information on what it is and the calculation can be found here:
https://www.simcountry.com/statdocs/indexes_the_welfare_index.html
Something like Edu/Health/Trans 130, Social 92 are good values to shoot for.
The corporation types you are choosing to build seem to be okay, but you may be overbuilding. A rule of thumb is traditionally you may support around 1 corp per 1 million population you have. Your corporations need full hiring to be successful, and you are currently experiencing a shortage of high tech workers. Overbuilding is likely contributing, 35 corps vs 31 mil pop, but also keep an eye on your education priorities to supply yourself the mix of workers you require.
On the expenses side, your country is unable to support a military in its current financ
Thanks Aries. I will implement your suggestions. I will check out that site you mentioned.