Data Table Converting in one column

Hi,
I have a data table and i want it to rearrange it so that all data that was in horizontal rows now would be in one vertical column,
when data from one row would end the data from second row would continue.

Data:
1 4 5 6
2 3 4 5
...

In the end it should be:
1
4
5
6
2
3
4
5
...

In the attached file I tried to do that manually, but as i have 11 thousand rows it would take a century to do that, is there a way how to make it easier?
Thank you.

Try this...

Thanks..

@ abduljaleel.mca

Nice one - except column Y gets overwritten. You need an offset when finding the next available row as in

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Regards
Alastair