I feel you on losing all that time on Facebook. I lost a lot of time there as well when I could have done more on Steem/Hive, while they make money of me, instead of the other way around.
You will reach your 50.000 goal much sooner than 3 years I think, if you reinvest most earnings that means that growth will be more exponential instead of linear. So the more you grow, the faster you earn and grow. :)
They are all valid reasons and most people have a variation of those same reasons. And with some determination and discipline and most of all having fun while learning a lot, you will get there.
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Thank you so much. Appreciate your kind words.