I'd get hold of some pure synthetics resources or a tutor and basically start again. It doesn't matter if he is dyslexic or not research has shown that this is the best way to learn to read and that mixed methods are the worst.
We didn't get our son assessed until he was 7 or 8 after several years of him gradually hating reading more and more, so that he would outright refuse to look at the books he brought home from school, and throw huge tantrums about being (gently) encouraged to learn his spellings. School knew there was a problem, but the SENCO was convinced that he was autistic despite him having several negative assessments, and none of his teachers feeling that that was the issue. Plus dyslexia runs very very strongly in the family, and the things he was struggling with were very similar to the experiences of his cousin, my brother, two cousins and aunt. As a parent who has never really thought about how to read (I'm a total bookworm and was an early reader) it was really difficult. ds loved to be read to, was very very articulate, and wanted to know about everything. He was just incredibly frustrated, and had started to think he was stupid.
Post assessment the SENCO sent us a letter saying that ds would get no educational help, just behavioural support as before. We hadn't expected help from school to be honest, we sent the report in for his teacher so she could understand where ds's strengths and weaknesses were, as it was a really helpful, very detailed report.
We did however get him some external tutoring, on the advice of a poster here (maverick) and it totally turned things around for him. Just six sessions of being taught reading with synthetic phonics from scratch, and you could see the light coming on that it was just a code, with rules, and that he could decipher it rather than guess, and guess and guess again.
I know that it was all about budgets, and appreciate that there were other children with greater needs, but if we hadn't done anything ds would just have fallen further and further behind and got more and more disruptive until he did meet the criteria but with a much lower chance of recovery.
He is still dyslexic but he is now a confident if not prolific reader, which is such a fundamental skill (he still is a very poor writer, but that is much easier to compensate for).
So I'd say to the OP keep on doing all that you are doing now, but really do read up on synthetic phonics, and if there is anyone in your community that can provide some specialist tutoring do look into it. We could tell after the first session that it was making a difference (as parents we had to attend to give ongoing support, and I found it fascinating).