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Is there any other kind of possibility of getting my checked luggage even if it's on different date? (Like if I let them put my luggage on another flight, while I go with the first scheduled and they notice me when I can pick it).
They will not put your luggage on a flight you are not on, no airline will as far as I know (but see below for cargo options).
If I just go like if I never read that mail, will they force me to leave my luggage there or just won't be able to take my flight?
You cannot take your luggage in the hold. They will either let you take it in the cabin (which may not be possible given how much space there normally is). It's also not clear if they'll charge extra, but I suspect not. Additionally if it's a bag that cannot possible fit under the seats or in the bins it's not going in the cabin.
That does leave the options as 'dump the luggage' or don't take the flight.
You say you can't change the day you leave, but can you change where you leave from? In articles on this (i.e. Daily Mail) it says:
A Ryanair spokeswoman told MailOnline Travel: βAll flights to and from Madrid are running as normal, however, customers have been requested to travel with cabin baggage only and have been offered the choice of transferring to alternative flights or alternative airports.
So it looks like you could go to Valencia or Alicante but there's no flights showing for them -- although Ryanair's website may be acting up, there's no flights showing for a lot of destinations.
Your best bet is to talk to Ryanair about it, I would either use their Live Chat service (linked on the Useful Info page). Or @Ryanair on Twitter. I'd say call but, predictable, I can't find a number. Note that their contact page also currently says:
Following our recent flight disruptions we are receiving high volumes of correspondence. If you have submitted a claim you should receive a response shortly. Please do not resubmit your correspondence as it may further delay our response to you.
So they should still respond to your message but you probably want something more interactive in this case.
Your other alternatives are to ship the luggage back, looks like DHL would do it for around 32 Euro (price list). FedEx are coming up as around 100 Euro, no price list that I can find just a 'quote' thing but there may be cheaper options.
There's no DHL office in Berlin SchΓΆnefeld but there's a list of other cargo handlers who may be able help.
Alternatively, you're going back to Madrid, which is doable via train if you have no other option. But I'd ship the baggage back and offset the cost with the refund.