So I am new to many things involved in trading. I am current...

So I am new to many things involved in trading. I am currently doing an experiment with a small account. I bought 5 poor ARPO stocks on August 18, and there was nothing left. Then of course the merger/reverse split happened on the 27th, which somehow avoided me before then. Anyway, obviously because I have less than 15 shares, I did not receive any AADI shares, but now according to my broker, I hold 5 long positions on CVR, but I can’t seem to do anything with it . Now my question is, what should I do? Will it expire after a certain period of time? Then what?
$Aerpio Pharmaceuticals(ARPO.US)$ $Chicago Rivet & Machine(CVR.US)$