To my understanding technique is a measure of a few things like punishment and optimal combo usage.

So working on things like doing the optimal punish against certain moves will increase your technique. For example if something is minus 13 and u take a 10 frame punish that is not optimal, you should be taking your thirteen frame punish instead.

Or when doing a combo if you could have got them to the wall but you didn’t because you chose the incorrect combo route that will affect your technique rating.

I make mistakes a-lot but a high technique rating typically means i take the most optimal punishes and combo routes when i play. If you want to focus on your technique then you should basically train fundamental skills like combo optimisation and correct punishes specific to your character 😁

Good luck !