Most guys make the mistake of being too apphrehensive. It may be
because of fear of embarassment, rejection or just a matter of
habit.
As competition is always around (she would have other suitors),
it is advisable to step up and state, if not a subtle, intention as
early as you can
You may want to find an excuse to follow up on something
relevant to both of your interests (as you mentioned there are)
That would lead you to getting her number.
Following, do not spend too much time just talking on whatsapp.
There should be a meetup as soon as you are able to. Think of it as
a timer of interest. Interest fades away fast, and distractions are
always around.
Hope this helps.
-Andrew
