Car, dishwasher and ev will be the biggest uses I imagine if you can shift them it will be huge. Girlfriend uses dehumidifier to dry clothes overnight too so we're saving on that as well. Everything else we don't bother with - we cook peak time, I play gaming pc peak time and gf tv and we've got a very powerful sound system, amplifier, stereo amp, 2 massive subwoofers etc so that all draws a lot of power but we're normally changing any behaviour other than car, washer & dishwasher
The EV is the main one of course, if I tried hard I could knock out 100kW on those, in 14 hours, get that wrong and there's no clawing it back.
I think our dishwasher uses <1kW on eco mode, which takes 4 hours, but some of the other modes are up to 2kW. Eco's cleaned everything just as well as any other mode, even using the cheapest of the cheap tablets, so we just do that over night every couple of days.
I bet the dryer, oven and then washer are quite high up the list too, induction hobs/ air fryers too but it's difficult to not use those near peak hours.
My PC has a 700W PSU, but don't think it's using that most of the time, but that's on nearly all day and three monitors, so I can't load shift those either. Probably only need two monitors though.
I need to have a think about getting a battery, might be able to get effectively near 0p average in good times, if I got one of those. The Givenergy AIO 13.5kW looks good. Would probably pay itself back in 4-5 years on current prices, and probably last a decade more than that.
If prices go up, it will probably pay back even quicker. Suppose if I can get it fitted where it can be moved if I move house, then there's no reason not to do it. Could add more solar panels (only got 4), but would need a new inverter, plus much higher fitting costs, and can't take those with me if I moved, only reason I've not done it. Not sure if you can use different panels on the same system either, but would assume you can.