To make the most of your talents, find a job that suits you better — a new workplace.
Literal
Self [gen-の] talent [obj-を] heart-content utilize [for-には], self [to-に] more fitting occupation, new workplace [obj-を] find [nominalizer-こと] is.
~には after a verb-plain form (生かすには) introduces a purpose: 'in order to do X, (what you need is) Y.' 思う存分 is a fixed 'four-character-feeling' adverbial meaning 'to one's heart's content / all one wants.' The final ~ことです turns 'find a job ...' into an impersonal prescription ('the thing [to do] is to find...'), a common advice pattern. ふさわしい pairs with に for 'fitting / suitable to [someone/something].'