thick to thin long hair

i used to have about earlobe length hair that was quite thick although my hair is naturally a little thinner, i used to go to the barber and say "cut it thick" and it worked but i recently grew out my hair with home done trims and now that it shoulder length it is very thin and i was wondering if there was a way to make my hair thicker without gel or spray and possibly not getting it cut at a salon (i just grew it out) but if that is that answer i am looking for what should i tell the stylist to do differently (also, is there a more technical way to say "cut it thick"?)

Cut straight across is often called a "blunt cut".