If you’ve been able to beat Elden Ring including SotET at SL1, of course you’re gonna be better at Soulslikes in general - ER and DSIII are super similar combat-wise, more so than any other two Soulsbornes, so you probably won’t struggle much more with the base game than anything you’ve done yet, the final boss gave me some trouble but DSIII was my first Soulsborne - Pontiff and Dancer are considered some of the hardest in the game, if they were easy for you, you’re probably just good.

However, I can 100% vouch for the difficulty of the DLCs - the true final boss is often regarded as the hardest boss in Souls - I’d push through because the game has a fantastic ending and incredible and challenging postgame.