They are trying to get 500 women to do hafrashat challah for him this Shabbat, so if you can, it would be a tremendous zechut. I don't know of any official sign-up for this, but if you can do this mitzvah in the merit of his refuah shlaimah, it's definitely counted in Shamayim.
Yosef Ezriel ben Chaya Michal, also badly injured in the Meron tragedy, is still in a very difficult condition. His family expressed deep appreciation for all the tefillot & kabbalot so many people are doing in his merit. Please continue!
19-year-old Amichai ben Ronit, who was one of the 3 yeshivah bachurs injured in the vicious Yishmaelite shooting attack, still needs our prayers. This was accidentally overlooked because he was released from hospital care early on, but he still needs our tefillot for a complete recovery.
Elad ben Julia, who was viciously attacked by Yishmaelim in northern Eretz Yisrael, has made amazing progress in the merit of all the tefillot. While still hospitalized, they were able to move him out of intensive care to a regular ward. But he still has a long way to go, so please keep davening for him.