Deep gloss shine comes from polish, not wax. Many polishes have fillers that disguise minor swirls and scratches so long as they are only in the lacquer (they should pass the finger nail test).
Alfieri and silver colours dont come up with deep gloss like dark colours such as red, yellow, dark blue, maroon and black. So that gives you a rule of dimishing returns - polishing more, using more wax fail to raise gloss levels.
Start with citrus wash. Wash it off. Then use a good tar and bug remover applied with a cloth. Wash it off. Now remove bonded in contaminants with clay. Wash down. Then car shampoo. Rinse. Dry with towel. Polish with Meguiars Stage 2 polish or Poorboys Blackhole showroom glaze. Then Dodo Juice purple haze carnauba wax (dont worry, it won't affect the silver colour even though it is suggested for dark colours). Apply s second coat of Purple Haze. Next time you wash, dry with a towel and finish with Sonax Extreme Shine detailing spray. Top up with wax every third wash and polish every other wax followed by wax.
Visit detailing world for good advice.