The Snowball should receive enough dividends to complete the buying for the current portfolio.

The new position will either be a higher yielding Investment Trust or maybe start to squirrel some money into a government gilt or a money fund depending on interest rates at the time, so when the market crashes there will be cash to buy a bargain or two. The market will crash, the timing is the unknown as it might roll along for a long while yet but the higher it rises the bigger the fall.

Better to follow the market than to predict the future.