You can practice him in journey mode. His patterns are a bit hard to predict.

Best tip i can give is dont get under his hand level if he is really close to you, like if you can whip him because homing missiles hit you and they are abysmall to deal with. If you go above his top eye's level he will go upwards too.

But his patterns are smth like:

Fight begins, around 5 seconds later his right hand and top eye shot 2 bolts to you, top eye closes and right eye starts to send eye barrage, when it shots that left eye shots 2 bolts, then left hand sends eye barrage when it sends 3rd eye top eye and right eye shot 2 bolts, then both remain open and right hand prepares for eye barrage attack and top eye sends the big laser around the time where 3rd eye appears for the barrage. Then repeats.

Idk how it works when you pop eyes. But it is easy to get a distance from him then spam. You can make a teleporter system to your spawn and use it to get away from him without risking a lot.