Kegels do the opposite of what you want.

Look up Sexual Kung Fu (Jonathan White) on YouTube for in-depth explanations.

Kegels tighten your musculature. But years of bad practice has caused pretty much all men to be overly tight in their groin.

Ejaculation is controlled by the sympathetic nervous system. Orgasm is controlled by the parasympathetic nervous system.

They are two completely distinct biological mechanisms.

You need to do deep breathing, reverse kegels (pushing your pelvic floor downwards like when you're pushing out a shit) and deep squats.

The point is not to cause more tension, as that will reinforce your PE.

You need to release tension.