Should i continue in real estate investment?

[Mike Jordan]

My income now is divided as per the following: 30% of my income generated from daily work (9 to 5) as typical white-collar, and 70% of my income is from real estate rental, i am afraid that real estate will collapse enormously. Should I diversify and generate other side business (side hustle)  or stocks? the problems that the yield of stocks or side hustle is less than 7%, but the real estate investment could generate to be between 12 and 20%. 

Another problem I don't have experience with side hustle or stocks, I have better experience in real estate, at the same time, all economists advocate strongly to diversify the assets. 

What is your recommendation to solve this dilemma?