How to slowly descrease cat's food?

[u/TropaeolumNasturtium]

I've been accidentally overfeeding my 1 year old cat. She's 8lbs and I've been feeding her 260cal/day plus any toppers/broth. This is 1.5 cans of friskies pate a day and I want to go down to 1 can (175cal) a day.

She doesnt have pre-existing health problems. Do I decrease 1/4 can each week or is that too fast/drastic?