Minecraft Strongest Slide Hard Enchanting?

I'm playing Survival and what is the strongest Dia sword you can create WITHOUT Mods / Commands?

I already have:

Sharpness 5

Momentum 3

Combustion 1

Shelf life 2

the next durability charm on 3 shows me the anvil on too expensive, so should I leave without durability for combustion 2 and plunder? Or what is the best possible sword without cheating?

Repair would be highly recommended:-)
Looting is also a good idea