Provide a larger number of results for image searches
Part of the reason that Google has got worse over the years is the decreased number of results provided for an image search. You used to be able to scroll for pages and now you get a relatively limited selection. Unintuitively a more specific search ('daffodil red' vs just 'daffodil' for eg) gives you far more images.
I'm sure this is done to save costs but very often I know there is far more imagery on a subject I'm searching for and I'll never be able to find it.
I would hope that by paying for a search engine I'd get a larger number of results, but with Kagi I generally get far less than Google (presumably also to save costs). I can understand running the searches isn't free and it's all a balance, but it makes it harder to justify the monthly fee if I have to put up with generally lower performance than Google.