A lot of P365 owners complain about their pistols shooting low. SIG pistols are typically set up for combat sight picture hold, in which the dot on the front sight is placed directly over the desired point of impact. But I have seen threads from P365 owners who say that even using this sight picture, they still need to hold higher than the desired POI. If you run a google search for "SIG P365 shoots low" you will find a number of threads on other forums discussing this issue.
Take a look at your sights. They should be numbered. The rear sight is probably a #8. On the rear sight, the number is on the right upright portion of the sight, but is very small and may require magnification to read it. The front sight has a number on the left side on the horizontal portion of the dovetailed base which should be a bit easier to read. It will probably be either a #6 or a #8. SIG Sauer has not been consistent in the sights they install on their various models of pistols.
If you really don't like the sight picture and you have a #6 front sight, you could shift your point of impact higher by installing a #8 front sight.