I’ve never invited donations for this site, but people who find the site useful sometimes ask if they can make a donation towards costs.
If you do want to donate, then rather than to me please consider a donation to STAMMA (the British Stammering Association), where I used to work and which I still support. You can donate at Donate (stamma.org).
Alternatively you could make a donation to a charity supporting your particular disability. I know people with many different disabilities use this website.