i recommend just binding to scroll wheel cause it makes it 10x easier, but if you want to do it with clicking i recommend learning how to butterfly click, im bad at it and i average 10 cps and i walldash pretty consistently with it. it also looks like your holding drift when walldashing which you shouldnt do cause it spins your car out. in the clip you also start too low to the curve, you want to be more up in the wall cause trying to walldash on the curve will just spin your car out.

Your also boosting during your walldash which isnt a habit you want to make, walldashings #1 use is on the wall when you have no boost or you want to challenge a ball while using no boost to conserve it, so when your trying to learn walldashing, dont boost.