English pronunciation work is about being understood, not about sounding native. The goal is that a listener follows you without effort — and the things that get in the way are usually not the sounds people worry about most.
Accent is not the problem
Almost nobody needs to lose their accent, and most people couldn't if they tried. Millions of people speak English with a strong first-language accent and are perfectly clear.
What matters is intelligibility: whether a listener can process what you're saying at normal speed without concentrating. You can have a heavy accent and be completely intelligible. You can also have quite accurate individual sounds and still be hard to follow.
What actually breaks comprehension
Word stress, more than any single sound. English listeners identify words largely by their stress pattern. Say PHOtograph as phoTOgraph and a native speaker often hears nothing at all — not a mispronounced word, but a word they don't recognise. This causes more breakdowns than any consonant, and it's the thing learners spend the least time on.
Sentence rhythm. English compresses unstressed words to almost nothing. "I would have gone" becomes something close to I'd'v gone. Learners who pronounce every word fully and evenly sound careful and clear to themselves, and oddly difficult for a native speaker to follow at speed.
A handful of sounds that change meaning. Which ones depends entirely on your first language. Arabic speakers and Spanish speakers struggle with different things, and so the useful list is yours, not a general one.
Speed that outruns your control. Many learners speak faster than their pronunciation can hold together, usually because slowing down feels like admitting weakness. Slowing down by ten percent fixes more than any drill.
Your first language predicts your difficulties
Pronunciation problems aren't random. They come from the sounds and patterns your first language doesn't use, and they're highly predictable.
A Spanish speaker tends to add a vowel before words starting with s. A Japanese speaker works on r and l as a pair. An Arabic speaker navigates a different set of vowels entirely. A teacher who knows your language can tell you in one lesson which three things are actually costing you, instead of handing you a generic list of forty.
What's worth practising
Record yourself. Thirty seconds, then listen. Nothing else shows you so quickly the gap between what you think you said and what came out.
Learn the stress pattern with the word. Not afterwards. A word learned with the wrong stress has to be unlearned, which takes longer than learning it right.
Shadow real speech. Play a clip, speak along a half-second behind, copy the rhythm rather than the words. It trains the compression that textbooks never mention.
Get the specific list. The three sounds that actually matter for you. Someone has to tell you which they are — you can't hear your own.
Where to start
If people ask you to repeat yourself and you don't know why, that's a diagnosable problem, not a vague one. A teacher can usually identify the pattern within a single lesson, and it's almost never the thing you expected.