1. Lilium let it be there where they are, chop off the top leaving 1 inch. They will develop shoot and bloom again, if it's in full sun shift to semi shade.

2. Nargis, freezia, chinchirinchi, gladiolai and others bulbs - let them grow and store food to the max. Keep watering and fertilizing.

2a. When the leaf start yellowing stop water and shift to semi shade

2b. After a week or so, dig out the bulbs carefully, chop the top leaving an inch, clean the bulbs and treat them with any fungicide powder (saaf bavistine) name them tag them and keep separately.

2c. Keep them in a cool dry place for a couple of days

2d. Store the bulbs in paper bags lable each bag and keep them in a coldest place of your home (not freeze or freezer) The only issue in leaving out in ground or in open is that they should not rot, or dry off completely due to our heat.

Lilium gladiolai nargis chinchirinchi, no problem, But others tend to dry out if there is too much watering or flooding during rainy season. Opposite to this they also tend to dry out due to heat of our summers.

Maybe if in pots they can be shifted to a cooler area post leaf are dried out. Gardening is all but experiment and experience, there are so many variables that no one supreme method is there. For some bulbs flowered profusely for some sparingly and for some none at all. Though they were same for all. Hence keep on trying