Before you adjust your crosshair or sensitivity, you must ensure your connection to the server is flawless. Poor "reg" (hit registration) is often mistaken for bad aim. You could have perfect aim, but if your rates are default, the server won't register your shots correctly.
: To ensure bullets "register" correctly on the server, configs include specific rate commands such as: rate 25000 (depending on the server). cl_cmdrate 101 cl_updaterate 101 ex_interp 0.01 (to minimize interpolation lag for clearer hitboxes). Popular Configuration Features Many "Best Aim CFG" packs available on platforms like Steam Community include additional visual tweaks: Small Crosshair Cs 1.6 Cfg Aim
Add these for quick practice with bots: