Sell positions for a larger down payment or convert them into dividend paying for mortgage?

I’m 20 and just thinking about purchasing a home (hopefully) 10 years from now and I want to educate myself.

I live in Canada where I have a TFSA (similar to a ROTH IRA), RRSP (retirement), and a FHSA or First Home Savings Account (for purchasing/down payment on a home).

Would it be smart to liquidate my positions in my TFSA to put a bigger down payment (on top of my FHSA capital) and lose my positions, or convert my positions into high dividend paying stocks or even a HYSA to pay off part or even most of my mortgage (depending on how much money I’ll have then)

Any withdrawal from my TFSA is tax-free