I got my OT 3 months ago. In the beginning I just placed samples on the sequencer.
To move forward, there are imho 6 ways:
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check the forum and see what other ppl are discussing. chances are, they are discussing stuff you don’t know yet, e.g. the fader transition trick or sample chains. Take that inspiration and go back.
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work with the machine and find yourself thinking “hm, I’m missing feature x. can this be done somehow?” then read the manual and figure it out, do it. for instance, it took me quite long to sample internal tracks to other tracks.
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look at the screen. you will find parameters you don’t understand and you haven’t used yet. take this as an opportunity to browse the manual for it.
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open the manual on some random page and read it. see if you really understand everything. if not, go practise.
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pick some function - like e.g. design lfo - and find out what functions it offers. did you know about the yellow lights and the tempo button? 
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pick a function/fx and try to use it in new ways. e.g. make delay stutters with faders and link the delay length to a nice designed lfo.
Most importantly, don’t try to do it all at once. take step by step. everything else will get you frustrated.