i don't think that a good plan. you can't know when bitcoin price is $500. i think it 's impossible. just wait until 4500$.
If you have decided and you are serious then you should not waste your time. Dont wait anymore and go ahead to start trading. If you just asking that it is good or not and think all the time you will remain thinking and will do nothing. If you take step you will succeed. Impatient and emotional people cant make profit in cryptocurrency trading.