Everyone is different, of course.
Blame karma ripening! LOL
Some people have incredible ability to focus, other minds meander around or experience 'mental sinking' really quickly.
I used to have a near 'photographic' memory. Now I can't remember sadhanas and even when I practise them every day I still need the text in front of me. However, images stick. In other words, we all have our obstructions as well.
Because we are all different, 'trying' to climb a ladder of attainment will motivate some, whilst others will feel attracted to a passive revelation.
Examine the elements: place, time, object etc. and experiment with changes to each.