[Vrul]

I changed the way you were hiding level text to a more permanent solution.

I commented out the line

TargetFrameSpellBar:SetParent(UIParent)

because is was causing an error for me. It also had a typo "UiParent" but maybe that is correct for your setup.

I used the code I posted in the other thread as a base and modified from there:

local frame, forceShow, inCombat, queue = CreateFrame("Frame")
local mayShowPetFrame, playerHasTarget = true

local function UpdatePetFrame()
    if not inCombat then
        local frame = PetFrame
        local unit = frame.unit
        frame:SetShown(mayShowPetFrame and UnitExists(unit) and (forceShow or playerHasTarget or (UnitHealth(unit) < UnitHealthMax(unit))))
    end
end

local function UpdatePlayerFrame()
    if not inCombat then
        local frame = PlayerFrame
        local unit = frame.unit
        frame:SetShown(forceShow or playerHasTarget or (UnitHealth(unit) < UnitHealthMax(unit)))
    end
end

local function DisableShowMode()
    frame:RegisterUnitEvent("UNIT_HEALTH", "player", "pet", "vehicle")
    frame:RegisterUnitEvent("UNIT_MAXHEALTH", "player", "pet", "vehicle")
    if inCombat then
        queue = nil
    end
end

local function EnableShowMode(override)
    frame:UnregisterEvent("UNIT_HEALTH")
    frame:UnregisterEvent("UNIT_MAXHEALTH")
    if not inCombat or override then
        PlayerFrame:Show()
        PetFrame:SetShown(mayShowPetFrame and UnitExists(PetFrame.unit))
    else
        queue = EnableShowMode
    end
end

frame:SetScript("OnEvent", function(self, event, unit)
    if event == "UNIT_HEALTH" or event == "UNIT_MAXHEALTH" then
        if unit == PlayerFrame.unit then
            UpdatePlayerFrame()
        elseif unit == PetFrame.unit then
            UpdatePetFrame()
        end
        return
    elseif event == "PLAYER_TARGET_CHANGED" then
        playerHasTarget = UnitExists("target")
    elseif event == "PLAYER_REGEN_DISABLED" then
        inCombat = true
        EnableShowMode(true)
    elseif event == "PLAYER_REGEN_ENABLED" then
        inCombat = false
        (queue or DisableShowMode)()
        queue = nil
    else
        mayShowPetFrame = UnitIsVisible(PetFrame.unit) and PetUsesPetFrame() and not PlayerFrame.vehicleHidesPet
    end
    UpdatePlayerFrame()
    UpdatePetFrame()
end)

frame:RegisterEvent("PET_UI_UPDATE")
frame:RegisterEvent("PLAYER_ENTERING_WORLD")
frame:RegisterEvent("PLAYER_REGEN_DISABLED")
frame:RegisterEvent("PLAYER_REGEN_ENABLED")
frame:RegisterEvent("PLAYER_TARGET_CHANGED")
frame:RegisterUnitEvent("UNIT_ENTERED_VEHICLE", "player")
frame:RegisterUnitEvent("UNIT_EXITED_VEHICLE", "player")
frame:RegisterEvent("UNIT_PET", "player")
DisableShowMode()

function ToggleUnitFrameForceShow()
    forceShow = not forceShow
    if forceShow then
        EnableShowMode()
    else
        DisableShowMode()
        UpdatePlayerFrame()
        UpdatePetFrame()
    end
end

--[=[---------------------------------------------------------------------------
Other tweaks
-----------------------------------------------------------------------------]=]
CHAT_TAB_SHOW_DELAY = 0
CHAT_TAB_HIDE_DELAY = 0
CHAT_FRAME_FADE_TIME = 0
CHAT_FRAME_FADE_OUT_TIME = 0
DEFAULT_CHATFRAME_ALPHA = 0

ChatFrame1:SetTimeVisible(5)
ChatFrame1:SetFadeDuration(3)

GameTimeFrame:SetParent(UIParent)
GameTimeFrame:SetAlpha(0.4)

GarrisonLandingPageMinimapButton:SetParent(UIParent)
GarrisonLandingPageMinimapButton:SetAlpha(0.4)

MiniMapMailFrame:SetParent(UIParent)
MiniMapMailFrame:SetAlpha(0.4)

MiniMapTracking:SetParent(UIParent)
MiniMapTracking:SetAlpha(0.4)

PetFrameManaBar:HookScript("OnShow", PetFrameManaBar.Hide)
PetFrameTexture:Hide()

PlayerFrameTexture:SetAlpha(0)

QueueStatusMinimapButton:SetParent(UIParent)
QueueStatusMinimapButton:SetAlpha(0.4)

--TargetFrameSpellBar:SetParent(UIParent)
TargetFrameTextureFrameTexture:Hide()

do
    local SetZeroAlpha = function(self) self:SetAlpha(0) end

    hooksecurefunc(PlayerLevelText, "SetVertexColor", SetZeroAlpha)
    hooksecurefunc(TargetFrameTextureFrameLevelText, "SetVertexColor", SetZeroAlpha)
    hooksecurefunc(FocusFrameTextureFrameLevelText, "SetVertexColor", SetZeroAlpha)
end

The macro text to force showing PlayerFrame and PetFrame (if applicable) without having a target is:

/run ToggleUnitFrameForceShow()