I'm currently a H1B visa (Temporary Worker) holder working full time in the states, trying to start my real estate investment.

I believe they start in the high 9's currently. you wont get to your $20k out of pocket target on this scenario specifically, but the point is, there are some lenders which will work with out of the box deal structure (for a premium).

Our current society tells you to take shortcuts, which is why you end up with $75,000 in student loan debt, thinking it would somehow propel you to riches and glory faster.

If the unit they are currently renting does not meet that requirement, then they will need to move to a unit that does.The landlord is under no obligation to lower their rent or change their terms for an existing tenant.  

.- He recently inherited a 3-bedroom single-family home in Fremont, CA, valued around $1 million, currently rented out for $4,000/month.Alex's main concerns are balancing his full-time job with the demands of real estate investment, managing cash flow effectively, and understanding the potential tax benefits.- What investment strategies should he consider?

Does the property currently cash flow well?

If you have enough equity in your current home, you could look at taking out a HELOC against it. 

I currently live in Austin, TX in a home that I’ll be renting out in the next month or two when I relocate to Nashville for work.

I'm currently house hacking (renting rooms) my current primary residence which is a single family home and has a mortgage.

You have the funds and can rent out your current place I say GO FOR IT!