Startup offer

Startup offer Got an offer from a late stage startup which might IPO or be acquired in next few years. Strike price is $6 preferred price -$10. Revenue growth is 3x in 3 yrs. I know it's a low-ball offer. How much equity should I ask for? My current TC is 430k. Do I base my negotiation on matching my current comp at 2x the valuation considering the most optimistic exit might be 2x or 3x the evaluation.