On existential fears see de Botton 2013, p. 142-143.
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Writing a piece of text while feeling in a specific state of mind is a great idea. Reading it again later on can help you access it again.
Same goes for art thata resonates with you. It can help you reaching a desired state of mind.
A contemplative state of mind can be especially helpful to explore your personal existential fears and I personally have a lot of background thought going on all the time about death and the meaning of life.
=> [[Don't fear the Reaper]] : Some art that could help me to get in a contemplative state of mind could be very helpful to gain perspective on these spiritual realms.
=> [[Escaping the chaos of the world]]