How to prevent razor bumps?

When I'm shaving my pubic area I soak in the bath (shower water gets cold too quickly) do everything first so the hair has time to soften then I put on bikini zone and shave against the grain and rinse with cold water (I use to always do with the grain and it barely helped with shaving bumps and made me always stab my boyfriend with hair 😂)
Anyway, it works for the first two to thee days but when the hair starts growing back in I get horrible razor bumps that itch and last weeks and I end up waiting till they go away to shave again. I rather not shave if it only looks good 2-3 days out of the month. I have super sensitive skin, what can I do to prevent this?! Please, I'll try anything!