Platinum Hair Advice

So it’s been a little over a month now and I’m allllllllmost platinum. Everytime I go to my stylist (which is about once-a-week), he says my roots have already grown in like crazy and has to bleach them again with 40v. Does anyone out there have advice about root maintenance, best at-home products to use and how often you touch up?

• platinum hair
• help
• advice