Research from the Charities Aid Foundation (CAF) has shown that 23% of donors don’t use Gift Aid when they make donations. This was revealed in CAF’s UK Giving 20021 report https://www.cafonline.org/about-us/publications/2021-publications/uk-giving-2021
So in theory you could increase your individual giving by up to 25% just be persuading donors to Gift Aid.
Even if you are good at this now, why not see how you can make the Gift Aid message even more compelling, to get the most of every qualifying donation?