How to make caddy run in/from a directory as a service in Ubuntu 20.04.2?

I installed caddy with "sudo apt install caddy" and have everything setup and working, but I also want to run caddy automatically from boot. When I use

sudo systemctl enable caddy

and reboot, I get a 403 error from my website. To fix this I kill caddy and use

cd /home/user/Desktop/websida

then

sudo caddy run

, then it's fixed, no errors but I have to do this every time I boot, hence why I want it to run as a service but in another directory: /home/user/Desktop/websida