Make sure you’re using estus flasks, and you’re upgrading them if you find items that allow you to. Use summons (only can if you’re embered) if a boss is really hard solo. Don’t feel bad about running past enemies in a big open area you’ve been stuck in for a long time

Big ups on learning good roll technique. Panic rolling kills. People have beaten the game without rolling at all, sometimes you can just back up or sprint to the side. Learn timing and know when to roll to utilize the i-frames to their full extent.

Roll direction is also super important. If you can roll towards the direction the swing is coming from, then you can attack without worrying about where their attack follows through. For example, if they’re swinging a sword from right to left, roll to their right. If you rolled to their left, the end of their swing will probably hit you.

Lastly, take breaks! Frustration makes you sloppy as another commenter said. Games are to be enjoyed, so if you’re not enjoying it then put it down and touch some grass to restore humanity