Mate, I would hold if you feel comfortable that the coy will increase in value over time.
No point selling at loss just to reduce tax, I find it defeats the purpose of trading and winning throughout the year.
A capital loss can only be put against a capital gain. So it cannot be offset against regular income.
Any losses you have made throughout the year will offset any gains.
If the gains outweigh the losses then you are assessed on the gain, and the reciprocal is true.