Are offers less frequent now?

I had a gold card for several years and had used to have 25-30 offers, if not more, at any given time. I cancelled that card a couple of years ago and have recently got a platinum, but there don’t seem to be many offers going on - I barely have 10, including the dining credit and Harvey Nichols.

Are you experiencing a reduction in the number of offers available, too, or do I just need to give it more time for offers to show up?