Many good emails are in Junk Email, spam

Here we go:
Since some time now the Junk Email function seems out of control.
Many good emails including my co workers ones end up in Junk Email.
They are NOT junk/spam on my server. No.
I can click in the menu move to inbox, remove blacklisted email/domain many times, it does not change the behaviour. Like this has no function at all.
Please help, this is highly frustrating and time consuming. 20-30% of my daily good emails go into junk.

This really depends on what is moving the messages to Junk/spam, how you stop it.

Normally, it is your server, so you will need to login to their webmail interface, select the message in spam, and mark it as not spam. Some providers have an option to whitelist senders so check on that also. Thereafter the server should always leave messages from that sender in the Inbox.

But it can also be caused by eM Client moving the messages if you have previously blacklisted the sender or their domain. If that is the case, go to Menu > Settings > Mail > Blacklist > Manage Blacklist. See if the sender’s address or domain is in the list and remove it.

I log into the server every week.
I mark good emails not spam and whitelist them if any as a routine.
I also did now for testing whitelist emails which are not in spam. Whitelist emails in the inbox which end up in eM Client spam.
No change, like 50% of my good emails end up in EM spam. Emails I receive since years, even from my colleagues.

As for the eM Client blacklisting: I do not blacklist my colleagues, banks, customers, suppliers in etc. EM client. No previously, not now and I will not in the future.
I tried a few times this function with real spam but I do this on the server having them deleted there.

I have tried so many times whitelist, move to inbox etc.
I am out of ideas. I have 4 email IDs and with each I have to go to spam to get half of my good emails out of the spam folder.
It seems random, spam is in my inbox as well as good email. And spam and good ones in the spam folder.