```java
    public static void clearState(Player player) {
        resetMaxHealth(player);
        fullHeal(player);

        player.setFoodLevel(20);
        player.setSaturation(20);
        player.setExhaustion(0);

        player.setLevel(0);
        player.setExp(0);
        player.setTotalExperience(0);

        player.setNoDamageTicks(0);
        player.setFallDistance(0);
        player.setFireTicks(0);
        player.setArrowsInBody(0);
        player.setFreezeTicks(0);
        player.getInventory().setHeldItemSlot(0);

        player.setGlowing(false);
        player.setInvisible(false);
        player.setInvulnerable(false);
        player.setGravity(true);
        player.setCanPickupItems(true);

        player.setVisualFire(false);
        player.setInvisible(false);
        player.setInvulnerable(false);
        player.setHealthScaled(false);
        player.setSprinting(false);
        player.setSneaking(false);
        player.setAllowFlight(false);
        player.setFlying(false);
        player.setGlowing(false);
        player.setCollidable(true);
        player.setGravity(true);
        player.setCanPickupItems(true);

        player.closeInventory();
        clearInventory(player);

        player.setPlayerListName(player.getName());
        player.setDisplayName(player.getName());
        player.setCustomChatCompletions(Collections.emptyList());

        player.setGameMode(GameMode.SURVIVAL);
        player.setCompassTarget(player.getLocation());
        player.setLastDeathLocation(null);
        player.setRespawnLocation(null);

        player.resetCooldown();
        player.resetPlayerWeather();
        player.resetPlayerTime();
        player.resetTitle();
        player.resetIdleDuration();

        ActionBarUtils.send(player, " ");
        TitleUtils.send(player, 0, 0, 0, " ", " ");

        removeEffects(player);

        player.getPersistentDataContainer().getKeys().forEach(key -> {
            player.getPersistentDataContainer().remove(key);
        });

        player.eject();
        for (Entity entity : player.getPassengers()) {
            player.removePassenger(entity);
            if (!(entity instanceof Player)) entity.remove();
        }

        for (Iterator<KeyedBossBar> it = Bukkit.getBossBars(); it.hasNext(); ) {
            KeyedBossBar bossBar = it.next();
            if (!bossBar.getPlayers().contains(player)) continue;
            bossBar.removePlayer(player);
        }

        for (Attribute attribute : Attribute.values()) {
            AttributeInstance attributeInstance = player.getAttribute(attribute);
            if (attributeInstance == null) continue;

            for (AttributeModifier modifier : attributeInstance.getModifiers()) {
                attributeInstance.removeModifier(modifier);
            }
        }
    }

    public static void resetMaxHealth(@NotNull Player player) {
        AttributeInstance healthAttribute = player.getAttribute(Attribute.MAX_HEALTH);
        if (healthAttribute != null) healthAttribute.setBaseValue(healthAttribute.getDefaultValue());
    }

    public static void fullHeal(@NotNull Player player) {
        AttributeInstance healthAttribute = player.getAttribute(Attribute.MAX_HEALTH);
        if (healthAttribute != null) player.setHealth(healthAttribute.getValue());
    }

    public static void clearInventory(@NotNull Player player) {
        player.getInventory().clear();
        player.getInventory().setArmorContents(null);
        player.getEnderChest().clear();
    }

    public static void removeEffects(@NotNull Player player) {
        for (PotionEffect potionEffect : player.getActivePotionEffects()) {
            player.removePotionEffect(potionEffect.getType());
        }
    }
```