Speak a lot. Speak out loud. I had major problems with English pronounciation, especially with the th sound(s), but now I am able to speak fluently without choking on my tongue. It took me a couple of years though.

Generally don't try too hard to pronounce the sounds. Relax while you pronounce and focus on each individual sound, not trying to "run before you can walk". And remember that it's better to practice a little every day than for hours once in a while.

I didn't find the right solution from the internet.
References: https: //www.lingq.orum/crsaorum/what-s-improve-my-english-sping-skill/

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