"Slow" exponential decay

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I am sorry if mathematics is the wrong place to place this. I simply don't think this is a stack-overflow-question...

I need to price my storage per TB, but i don't want to do this linear. 1TB should be 16\$, going down to 12\$/TB for capacities around 10PB. My current formula (in excel, please excuse!) is =16*t^-0.03 where t is capacity. This gives me a curve, but it's the "wrong" way around. I'd like it to stay flat for a while and then drop, not drop and stay flat. I tried to google, ask chat-gpt, but i can't figure out what exactly to look for. Could you give me a hint in the right direction?

Thank you so much in advance! Chris