Assalamualaikum Ustadh, if I don't remember to say "Wa Barik ala Muhammed" in the Salawat, is my Salah valid still, I learned about it in the past but I kept forgetting to say it, now I recently learned about it again but I kept forgetting it

Ustadh AbdulAziz al-Haqqan

If you forget, the salah is valid. Do your best not to forget.