Is there any remedy for this regret?

Abdur Rahman Al-Sunabihi (Rahmatullah Alaih) narrates:

We set out from Yemen to present ourselves before you (Prophet Muhammad ﷺ). When we reached Al-Juhfah, a rider informed us, "We buried the Messenger of Allah ﷺ five nights ago."

(Siyar A'lam al-Nubala by Al-Dhahabi: 3/505)