Welcome to Steemit @thuban! :c)
That is a pleasant set of interests that you list - and its perfectly alright to choose multiple topics to be central to your 'brand'. :c) Establishing a personal brand is important when starting out - as this is how people begin to gravitate to you for a reason.
Tips? A quick read through this post may prove helpful.
Thanks for the great tips; your post was a very helpful overview of lessons learned.
I am glad that you found them useful @thuban. :c) Every day is a learning process and so I'll be looking to post (and begin referring to) an improved version eventually. ^_^