I am Java/Spring Boot/Microservices/Rest API Professional. Is it easy teach online these niche skills or take projects as a freelancer?

I am a Java backend developer and have extensively worked on Spring Boot, Hibernate, JPA, Rest APIs and Microservices Architecture.
I am new to front end.

I want to start something kind of a side hustle.

I believe I have two options.

1) Shall I start teaching online and helping students/professionals to get skills? OR
2) Shall I take up freelancing work. Not sure what's the opportunity frequency for Java, Spring Boot, Microservices in freelancing world?

What can be easier to start and more beneficial in terms of finance?

I would recommend you to get into blockchain programming, the scope is huge and you'll be able to get a lot of freelancing work along with students.