how to sing the low notes easily after going down from the high notes without straining

when i sing the high notes i use the power of my support to get there But when I go back to the low notes i get the same power of my support and i can't control it it makes me singing the low notes so hard and that causes strain and tension is there any way to fix this? do i have to releas my Diaphragm gradually when I go back gradually to the low notes ?
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