I'd get rid of DIY shows, property shows, most reality shows (not all), limit the game shows, soaps would be once or twice a week, and I would introduce more general entertainment shows (think saturday night takeaway, the one show, that sort of stuff)

dramas would still be a thing, but mostly limited to half an hour per episode (to accomadate other stuff too)

new music show to replace top of the pops)

I'd also introduce a new religious format on a sunday (think songs of praise but more in depth)

kids would still have their programmes (their own channel for cartoons), and the existing blocks (such as citv on a saturday morning) would show educational stuff rather than cartoons (think horrible histories)