Hey Mate,

Hope you are doing well,gald to here that you want to peruse something trendy. Yes it is very possible to join courses for Block-chain and cryptocurrency  without having any background in this fields.

You may join Courses online(Which is most preferred in this Covid era),by this you can learn from the industry experts about the respective technologies.

Another Good option:

If you are interested in perusing B-tech ( as you mentioned you have completed diploma), You can opt block-chain  or cryptocurrency  as your specialization their. Which will also help you to crack a Job directly from your college.

And believe me these both are the future. Good Luck mate