I was diagnosed with SCA 6 8 years ago but my first symptom started about 4 years before that when I noticed that I was slurring a bit and sometimes had difficulty pronouncing words. ( My GP at the time dismissed this and I think he put me down as a hypochondriac!)
After 12 years I sometimes explain to people that I have trouble with my speech and often people say they haven’t noticed it but of course I am aware of my difficulty. About 7 years ago I I started a programme of self help.
I did have a few sessions with a speech therapist but didn’t find it particularly helpful. The reason I I believe I have been able to delay the progression is my reciting of tongue twisters three or four times a week. I do this using some I have downloaded from the web..
I found the best set of tongue twisters on the following web site. Quite a marathon to recite them all in one go so I do half one day and the other half the next.
davidpbrown,co.uk/tongue twisters
Hope some people find this helpful.