Rather than thinking into amount you should do the exercise to review and classify all your funds into different class of assets (e.g. cash, bonds, shares, real estate… ) and expresse them in percentage of your total wealth.
Then based on your risk awareness and tolerance express your target class allocation.
The last step will be to move your cash and reallocate it accordingly. You can spread the love over few months to ease the change.
As French born, I am really conservative and it help me to be more risk taker.
I have detailed it in few charts in my portfolio.
I was 90% Cash invested in 2016. I am still targeting 70% shares allocation…