There are 2 sets of rules that have been forgotten since the mid 1800s.
The silent letter rules and the substitute letter rules.
I stuck them on one of my websites so anybody can take them for free, no click bait.
We used them when we homeschooled, very effective.
You might see a thing about t-shirts for sale.
I no longer do that.
I use the Megawords series at the high school level. It’s a multisensory and systematic approach for decoding and encoding multisyllabic words. At first, students think I’m treating them like babies, but eventually they look forward to Word Study Wednesday. When I teach the “ible” and “able” rule, they never forget! Kids need explicit instruction when they are struggling readers.