You email them and say you're looking to chat about your plans for the next year. They'll set up a meeting in no time. This is the norm! Running a business on services purchased semi-anonymously is not.

Show them the invoice of your current cloud provider. If it's a big enough number then...

I work in gcp as account manager for enterprise, you won’t believe I chase deal for as low as 2k per month, tough time, every dollar counts