At least from the 20th century onwards; I find the results of 'spiritual techniques' to be so unimpressive as to suggest that they are at best useless and more likely spiritually-harmful.
By spiritual techniques I mean the use of all types of external assistance from symbolism and ritual, through prayer and meditation (of many kinds) - to reading, group work (of many kinds), vigils, magic, music, fasting, pilgrimage and the power of place... everything you can think of.
People are always claiming that one, other or all such things are helpful and yet - just look at the results! And look where we are now?
It strikes me that this apparently counter-productive effect of almost any 'method' of spirituality may have a very simple explanation; which is that all such techniques are external, when what is needed is internal.
The more external spiritual assistance we seek, or come to rely upon - of whatever possible type; the weaker and more-passive becomes our inner spiritual strength.
Any yet it is this inner spirituality which is needed now above all.
If not, then what?
If I am saying that any and all external methods or techniques are harmful - then what is left for us to do?
I suppose the answer lies within us: That all which is both good and also strengthening over the longer term needs to come from within our-selves and/or be discerned and chosen by our-selves (with a sense of fullest responsibility and in light of the ideals of salvation and theosis); aiming at our resurrection to Heaven, and that of those we love; and to learn the spiritual lessons of our own mortal life.
And everything else is a - more-or-less harmful - distraction.