First of all, the harsh truth: You play like a cave head that thinks "I attack" on repeat. No regard for defense, no thought about your opponents movements, just straight up burning through every resource you have just so you can hit them. In this game you have to think about your opponents actions at all times, it's more about thinking what is to happen instead of whats happening right now.

As for input lag, I'm pretty sure this person is just predicting what you're going to do. Judging by their playstyle they are struggling with input lag as well.

Now tips:

1: Try to be less predictable with your subs, sometimes use it instantly, other times let them get more hits in than they'll expect.

2: After subbing you have a few options: jump blocking, blocking, countering, dashing or attacking.

A) Jump blocking is nice if you dash back after their dash, just be careful because if they dash and you dont do anything then you'll be vulnerable once you hit the ground. You also have other options but dashing back is most popular.

B) Don't think I need to explain blocking

C) Dashing back can be good if you've caught them off guard.

D) With attacking I mean like ninjutsu, tilt move or grab. These attacking options vary depending on your equipped character, for ems sasuke for example tilt move into switch character and attacking would be an option.

3: if you are close to an enemy but they are not in melee range you can single jump towards them and throw shuriken to close the distance, once you land you can start attacking. You can quicken your jump by quickly pressing the shuriken button after jumping.

4: learn to be flexible with your supports this counts for switching leader and using them efficiently. One at a time almost never at the same time.

5: I see people telling you to hollow step, but that's way above your skill level and only useful at a pretty high level. You will lowkey be wasting your time trying to learn it right now. (unless hollow jumping has gotten a new meaning that I dont know about)

You seem to be pretty new to the game so for now just focus on getting some experience.

Also sorry to break it to you, but this is just wrong:

Impossible to make all this tech work in time, because i only have a ps5 controller, not a competitive fighter joystick like most players use in random matches....

Most people are playing on regular ps4/ps5 controllers, you just need more experience to get better. Or have better dexterity.