The 9€-Ticket is only valid in local and regional trains, not in longdistance fast trains.
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Other than those few limits, your nine-euro ticket entitled you to go anywhere in Germany, using public transport, as often as you wanted, for a calendar month. Children under six already traveled free.
The new 'Deutschlandticket', a flat-fee public transport card for regional trains and other forms of public transport, will be valid from May 1 onwards. Federal and local authorities have ironed out the final details of the ticket, which is the successor of the much-lauded 9-euro ticket.
The 9 Euro Ticket is valid on all public transport services in Germany. Moreover, it's valid on any local/regional route! And you can make as many journeys as you like.
Why the 9-Euro Ticket? In an effort to deal with increasing energy costs caused by the war in Ukraine, and to encourage Germans to use their cars less, and public transport more, the German government introduced a special discounted flat-rate monthly rail ticket valid anywhere in the entire country.
It is not valid on long-distance trains (such as Intercity Express (ICE), Intercity (IC) and Eurocity (EC) trains operated by Deutsche Bahn) and on long-distance bus coaches (such as those operated by Flixbus). The ticket is only valid for transportation in second class.
It is valid on regional trains (RE, IRE, RB, S-Bahn) in 2nd car class. It is not valid on DB long-distance trains (IC, EC, ICE, ECE) and with other providers, such as FlixTrain. The Deutschlandticket is available as a personal subscription at a price of 49 euros per month.
You simply take the next train. If you have savings fares which are bound to a specified connection, you need to obtain a written confirmation from the conductor on the delayed train (i.e. BEFORE the change) that the train is delayed, then you can use the next available train without any extra fees.