Should I cancel behavioral therapy?

So my son is 4 and about 7 months ago he started becoming aggressive especially during meltdowns which also increased and started lasting 2-3 hours long. Despite becoming more and more verbal each day he was struggling with a lot of big emotions. So I decided to get on a waitlist for ABA therapy and am waiting to hear back from another company that does behavioral therapy. He has bit/hit/kicked/thrown hard things/and even tried to attack our dog. However these past few weeks (he's been sick with one sickness right after the other) he has been a lot better. Not nearly as many instances of aggression and very few meltdowns. He's been really sweet and chill actually. So now I'm wondering should I cancel these services I'm waiting for? I mean has this happened to anyone else where your child just stopped struggling so much with aggression and meltdowns out of nowhere? I don't want them to finally come and then be like "why am I here, things are fine?" And I also don't want to take the place for another child that could get services sooner if we don't need it. Any advice or experiences are welcome! Thanks!