Have you used your 2019/20 £12,000 annual capital gains exemption? Consider selling shares where the gain is less than £12,000 before 6 April 2020.
Also, if you have any worthless shares consider a negligible value claim to establish a capital loss. You may even be able to set off that capital loss against your income under certain circumstances which could save tax of up to 45% of the loss.
As with all of our tax tips and web pages this information is necessarily summarised and of a general nature. If you would like detailed specific advice please contact us