First of all, I wish you the best of luck with your wife, that is the most important thing.
Further regarding the job, reading your posts, I cannot really say your English would be good for English standards but for Finnish standards for sure it is.
The Network engineer business, well I guess most will depend on your relatives, relations and friends. Without those, you will most likely never get in the same job you had, unless you have exceptional skills.
Important to have might be CCNA or CCNE or MCSE etc. for this job, I do not know from you post if you actually have those international papers, that would greatly help your case and only because those are international standardized certificates.
Something else, applying online or by email will not get you anywhere, 99 out of 100 don't even read it or at least will never reply,
You have to walk into a company (if possible) and ask for the right department manager and ask personally for any open positions, leave your CV at the same time with that manager. This will result in more effect than writing letters.
The problem you will have is that the current job market for (network) engineers in general is already bad for 8 or 9 years and is only getting worse because of all the foreign take-overs and sales, after which whole companies are dismantled leaving a lot of engineers searching for a job. Add to this that from about 10 years ago until at least a few years ago, about 20% more engineers graduated from educations every year, than there was work for them. So there is a huge imbalance in the amount of offered work and job seekers.
I would advise you to re-educate yourself into the field of healthcare a.s.a.p. so you can still take advantage of the shortage of personnel there (won't take long with all budgets cuts nowadays).
Don't look surprised if you find yourself driving a public transport bus in a year or two or find yourself stuck in a supermarket or cleaning job, although those jobs mostly go to the refugee immigrants with a permanent status, because they are mostly uneducated and therefore are less of a risk of leaving for a better job.
Summarized, if you ever want to find a job similar to what you do now, you will probably need "suhteet" which translates as relations that recommend you for the job.
Above is based on my own experience, although I am retired now
so I am not trying to get a job any-more, that is for the young and wild
And remember, Capitalism is a pyramid game, you must be willing to be part of that, but don't let it come in between you and your wife.
Good luck
