Do I still keep my ETH?

I've had some ETH for a few years now - not a crazy amount but enough that it's of value. I've never really understood or been passionate about ETH like I am with bitcoin so, up until now, I've just kept it in case it shoots up in value, whereas with my BTC I never plan to sell.

My question for the ETH community, what would be the reasons for keeping it?

I'm inclined to just buy more BTC with it and forget about ETH altogether but if there's a compelling argument to keep it, then I'm open ears.

EDIT - thanks for all the replies. Definitely some food for thought, though I can't work out it's made me more confused or not. Appreciate all replies though!