currently on 2 wl and I sent a letter of intent to my top choice school A already!

however, I consider school B my second choice (which I would also really love to attend). i can’t send another letter of intent cuz that would mean I would be sending to 2 schools so i’m trying to gauge when/if I should send another letter of continued interest and updates

here is the timeline: I interviewed end of January, sent an update letter early February, and was ultimately waitlisted in march. they don’t seem to have update letter limits but not sure if I should send another letter of interest/update now. only updates I would have is gaining more hours in the same activities.