I've received different advice - on one extreme is sell off all your rentals, take the cash and take the capital gains tax hit and invest in stocks/index funds (not from a RE investor, from people I know who are horrified that I have more than one mortgage), which I won't do.

My mental calculus is that I want returns in excess of 25% above what the passive S&P 500 Index has returned historically (~8%).  

I found one bank that uses LIBOR as the index for the HELOC.

It's also okay to punt on real estate and let the magic of compound interest do its thing in an index fund or two.

always love seeing others getting into the RE game early in life. i used to be a die-hard index fund investor & have since moved all my $$ into RE. you just seriously can not compare the two. wealth can be built SO MUCH FASTER in RE vs in the stock market. would love to connect and see how i can help you!

Literally everyone is a RE coach or some type of finance expert (typically buying stocks/index funds some crypto) and they talk on and on about "contact me about how to be successful and free from your W2 job.

If I didn't have this business then I would look at passive investment opportunities diversifying between real estate (SFR), index funds, and likely a private credit fund. 

. - We have about 1 million in our 401K, 403b, and other retirement accounts (95% Vanguard index funds). 

Hold growth stocks or low turnover index funds. 

I should add so many agents here, are gonna tell you this ******** about renting being a waste, but it’s literally cheaper by in some cases thousands a month when factoring in repairs, you can put excess savings into index funds etc. every single friend I have all of whom are pretty fiscally savvy have made the same calculation, I even have a good friend who is trying to sell his condo to rent because his monthly expenses will decrease when he sells his condo & he can be in a better area.