It is never a good idea to wait to start investing. If you have a stable income and if you have basic knowledge about Bitcoin, then you can start investing immediately. A real investor will never wait for a fall to invest, those who wait for a fall are basically businesses.
You don't have to have a stable source of income before you can start investing in Bitcoin, once you have a source of income, you can start investing while in the process of investing you can start sorting out your emergency and reserve funds.
Then you terming those that are timing the market before buying as business is not proper, they are traders fooling themselves thinking that they can outsmart the market, which is very much unlikely.
It will never be right to sell their holdings until the investment period ends. You have to be patient until the investment period ends.
Even though your investment period ends as you said, it makes no sense to sell everything off and becomes a no coiner overnight, what you should be doing is taking profit from your investment than sell off everything.