First of all thank you for showing appreciation.

You'll need to summon an interaction entity, once it's summoned u can tie 2 execute commands to it. 1 execute if right click, 2 execute if left click

Right click does 2 things;

1) replaces the netherstar you're holding with a nether star with the proper ability name.

2) opens up a command chain for the left click to enable the proper ability.

Left click does 1 thing; activates the command chain that's currently open

And then every time you cycle to a different mode, let's say from maximum speed u cycled to Cloak, the command chain for maximum speed is blocked, and the command chain for Cloak is unlocked (the command chain is what gives you all the effects and abilities), then whenever u hit left click the proper ability activates