I would agree with Redemption
I am a bit OCD when it comes to polishing and waxing (well my gf and neighbours think so

)
With Silver there is an early limit to what you can achieve when it comes to creating depth, but gloss and that shimmer are easier to achieve.
You can spend hundreds on different polishes and waxes (I’ve tried most of them lol), but the differences are marginal especially IMO with Silver.
If it were me I would probably: (all the following available from Halfords)
Wash - with a decent shampoo - AG Bodywork Shampoo or one of the Megs
Clay - (probably most important step) Megs Smooth Clay Kit
You could then polish and then wax, to be honest on Silver I would go for an all in one as Redemption says AG Super Resin Polish or Megs NXT2 – I think the NXT is slightly better on Silver.
Could then top with the AG High Definition Wax or even something like Simoniz Diamond Hard Wax – these will give extra protection but probably not add too much to the finish (AG HD Wax circa £40, Simoniz £4.50 – I’d get the Simoniz I have used this last week and the water beading is as good as the HD IMO).
Good luck with it – don’t forget Claying is the Key!
Rob