Any suggestions on how to save FPS Classes in a data store?

I've asked something similar to this but I couldn't understand it that much so I just need a brief answer, I don't need a script.

Basically, I'm making a FPS and the main problem I have is the data store. Of course I want to save your hard work within the game and all the stats in it but I'm not much of a data store genius or one at all and I keep failing, the script I'm currently using was pretty much off of a YouTube comment and it kinda works for saving multiple values but it's just repetitive and only saves some data.

local DataStore = game:GetService("DataStoreService"):GetDataStore("PlayerStats")

game.Players.PlayerAdded:connect(function(player)

    local key = "user-" .. player.userId


    local store = DataStore:GetAsync(key)

        player.Class.Stats.Kills.Value = store[1]
        player.Class.Stats.Deaths.Value = store[2]
        player.Class.Stats.Headshots.Value = store[3]
        player.Class.Killstreaks.Nukes.Value = store[4]
        player.Class.Stats.XP.Value = store[5]
        player.Class.Stats.Level.Value = store[6]
        player.Class.Stats.Prestige.Value = store[7]




        local items = {
                player.Class.Stats.Kills.Value;
                player.Class.Stats.Deaths.Value;
                player.Class.Stats.Headshots.Value;
                player.Class.Killstreaks.Nukes.Value;
                player.Class.Stats.XP.Value;
                player.Class.Stats.Level.Value;
                player.Class.Stats.Prestige.Value;
                }


        DataStore:SetAsync(key, items)

        print("Player Data Collected")

    player.Class.Stats.XP.Changed:connect(function() xp(player, player.Class.Stats.XP, player.Class.Stats.Level) end)


end)

game.Players.PlayerRemoving:Connect(function(player)

    local items = {
                player.Class.Stats.Kills.Value;
                player.Class.Stats.Deaths.Value;
                player.Class.Stats.Headshots.Value;
                player.Class.Killstreaks.Nukes.Value;
                player.Class.Stats.XP.Value;
                player.Class.Stats.Level.Value;
                player.Class.Stats.Prestige.Value;
                }

    local key = "user-" .. player.userId

    DataStore:SetAsync(key, items)

    print("Player Data Saved!")
end)

function xp(player, xp, level)
    if xp.Value >= level.Value * 500 then
        if level.Value <=54 then
        xp.Value = 0
        level.Value = level.Value + 1
        print("Level Up")
        end
    end
end

game.ReplicatedStorage.EmoteSelected.OnServerEvent:Connect(function(player, emote, placement)
    player.Class.Emotes[placement].Value = emote
    print(emote)
end)


game.ReplicatedStorage.CamoSelected.OnServerEvent:Connect(function(plr, active, camo, kind)

    print(camo)

    if kind == "Primary" then

        plr.Class[active].PrimaryCamo.Value = camo

    elseif kind == "Secondary" then

     plr.Class[active].SecondaryCamo.Value = camo

    end
end)

That's the short version, I use 2 scripts for the saving.

What I'm Trying To Save

What's in the classes to save

I know the script I have is bad but I just need some suggestions because I've been stuck with this for about a month now and it's the only reason I'm not pushing my game out.

Any help will be appreciated!