I wouldn't bother too much. I know how dyslexic people have a like long struggle with spelling. Three of my sons are affected and too put it bluntly they went through hell at school.
You'll pick it up if you look, cover, write.
You'll pick it up if you write it out 20, 30, 100+ times
You'll pick it up if you read more.
No they really don't!
You would have done if your parents had bothered to provide books, read to you, make you learn them at home.
We did all that with bells on. We also paid for private lessons out of school to boost their confidence.
Mine were lucky that we could do everything possible to help them. We found things they could excel at so they gained respect from others. It never really helped their spelling but they eventually learned to read well enough and managed the illusive grade C Eng Language.
Post 16 thing became easier. A levels and degrees and good careers have followed but there is still that worry that others judge them. Also the worry that their own children will have similar problems.
English spelling is far from straight forward. If you can understand what someone is trying to say that's good enough surely.