@Autumn KimNot a bad niche if you like pain and have staying power; this is not a strategy for a hands off investor that likes excel and internet research.  

The self serve option is hit or miss, I wouldn't use it in a city with strong squatters rights.

Do I have any other options?

Considering your situation and goals, here are some insights to help you navigate your options:1.

However, this comes with the caveat that you and your husband are prepared to cover any potential increases in mortgage payments after the renewal, especially if the new rate is significantly higher than the current 3.5%, which I ignore since I am not versed in the mortgage system in Canada (although it does sound a bit like an adjustable rate mortgage from what you described).Before making a decision, I recommend speaking with a financial advisor or a mortgage broker to explore your refinancing options and get a sense of what rates you might be looking at come June.

My suggestion for you would be to use the all powerful "Youtube University".

I’m in the process of learning about crowdfunding as a real estate investment option - to invest my money - for returns.What is your favorite real estate investment crowdfunding platform?

With interest rates at a steady increase, typically investors in Multi units are looking at 8-11% interest on conventional, commercial, and PML options.

Either option would cash flow around $300/m. 

I will definitely look into my options with those.