Welcome to the forum. Every person has a different definition or level of FI. Keep saving and working toward that goal. Once you reach it, then you can make choices as to what you want to do. Understanding your expenses and income needs in retirement is something that you can estimate now, then you can figure out the plan on how to get the required nestegg to support that. Your acceptable level of risk is a big factor in that equation.
It is good you like your self-employed job, beats working just to make it to an end goal while hating the journey!
The advice we're giving you is invaluable, that's why it's free
Experience is a good teacher, but the tuition can get expensive real fast
Semi-Retired 7/1/16: working part-time ( 60%) for now [4/24/17 changed to 80%]
Retired Aug 2, 2017; age 53