i generally think that too much of a focus on submissions can be negative. work on things like pressure, balance, defence, and then the other side of things is the flow. a big difference between a black belt and a white belt is things like when a white belt has an armbar and loses it, they will get passed or give it up. where as a black belt will be more likely to switch to their next submission and so on. a single submission is not amazing but the flow between things is where its at imo.
in saying that, if i had to choose, i would say that omoplata, spider web, guillotine, leg lock game. (straight leg lock id go with) and i dunno maybe from guard invisible collar.
top 5 non-sub techniques would be imo, electric chair sweep, basic rubber guard path, truck, prison guard, twister half.
if i made a top five, id say omoplata leg lock game spider web, electric chair sweep, truck.
i think omoplatas are just so easy to switch to soo many different subs and sweeps, leg locks is sooo different from mot jiu jitsu game and has a lot of variables in it, spider web is such a dominant position. electric chair sweep, generally stil works even when they are ready for it and truck is sooo multi-faceted as well.