Floor levelling fail

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Hi all. New to posting on this forum but I did a lot of reading here before I dived into working on my living room floor. Perhaps I should have done more since I'm in a bit of a mess now!

A friend and I mixed up and laid down a (relatively generous?) layer of Arditex NA on top of a very unlevel, uneven floor which was mostly 60's tiles plus some small sections of concrete. I used a nice big trowel to spread it around and worked it with the spiked roller to feather between batches and get the air bubbles out. It looked pretty good to my eyes when we packed up and left it to cure overnight.

Sadly, when I went to inspect it all the following morning, I found it had come out with roughly the same ridges and depressions as the original floor. A minor improvement perhaps, but far from good enough to lay a hardwood floor straight on top (which is my objective). My 2m level rocks end-to-end in several areas and there's one corner which is still a definite low spot.

Without really thinking it through, I went ahead and put down another (slightly more dilute) layer about 24 hours later, with much the same result only this time with more pinholes and other crappy finish problems since I had to do the mixing, pouring, spreading etc. by myself without my buddy's help and nicer tools.

I'm sure it's possible to grind out some of the highspots to the point where it can take a wood floor, but I don't even know where to start with measurements to find these and tools to use etc. Is this a relatively simple but labour-intensive job?

TBH, I think I've had enough and now want to get someone in to do it for me / fix my mess. I don't even know what sort of trade to go and ask for help on this one: a mason, a builder, a flooring company?
 
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Get a cheap laser line and set about 1m high. Window sill is a good spot.
Use a stick and mark where laser hits it at highest point that you can find.
Now you can move stick around room and place a screw in floor so it touches bottom of stick while the laser is hitting the mark on stick.
You can start by pouring self leveler on the low spots to screw height.
You need to seal floor prior to pouring so it runs freely and sticks.
Use a notched trowel to spread material as works better.
 

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