"Impossible" revenue goal

I’m ready to have a breakthrough in my biz. but when I do the “math” I have no idea how to make it happen.

I want to make $300k by the end of 2020.

I’ve been a coach for 10 years. The first six years I was a full-time coach for a corporation and made between $100k and $120k a year. For the past 4 years I’ve ran my own coaching biz and made around $70k as each year. My one-on-one coaching packages are $5000 for 6 months, I have an online class for $500 per person, a group coaching program that’s $200 per month for 6 months and I coach for corporate clients at $150 per hour.

I broke up $300k by month, which is $25k and I could figure out how to make that money for 2 consecutive months (with big stretch goals) but then I don’t know how to think about keeping that up with that level of revenue each month.

How do I start thinking or go about reaching my “dream and impossible goal”?