I'm unsure what your looking for ? Improving your credit score ? With 805, it's going to be hard as this would already qualify you for a mortgage, and you won't gain any lower rate or higher mortgage amount in Canada with a better score.
There are ways to borrow more based on your current investments though:
With your recently or soon to be achieved net worth, you could also have a look at a high net worth mortgage: some lenders will happily lend you some money on a 1=1 basis above a certain threshold, which can be a great help if you don't qualify on income alone. Most lenders require a minimum net worth in the 250k-500k range, but some like B2B currently have lower requirements.
Otherwise, borrowing using your investments as collateral may also be possible, albeit riskier in case of margin call. I know Mr. Money Mustache mentioned doing so using IBKR, which would also be my broker of choice for this kind of things: depending on your investments, they will allow you to borrow between 30-70% of their value with a good interest rate. This is however high risk, as IBKR is known not to make margin calls but to auto-liquidate positions, so things may get very ugly if the market sank quickly.
