How'd I increase player speed? (On certain message chatted)

Hello fellow modders, this is my second thread of needing help.

I am a beginner at Java and I was thinking of making a few commands to learn more about creating forge mods.

My current code works (I know bus is deprecated) which is shown below, but I want to modify it so it can ONLY contain hi, and it can increase speed.

@EventHandler
    public void init(FMLInitializationEvent event)
    {
        FMLCommonHandler.instance().bus().register(this);
        MinecraftForge.EVENT_BUS.register(this);
    }
    
  //Fired when a chat message is about to be displayed on the client
    @SubscribeEvent
    public void onChat(ClientChatReceivedEvent event) {
        String message = event.message.getUnformattedText();
            if(message.contains("hi")) {
                     Minecraft.getMinecraft().toggleFullscreen();
            }
    }

EDIT: Without any potion effects.

Edited May 12, 20196 yr by SteveRaft
Clairification