I am in the Lost Grove and the enemies are like level 65 and I am wondering I should change this pet's element and what proficiency. Can u check out my party, as well. here is Brownie https://www.sylestia.com/proficiency/?pet_id=5426886

Here is GoldHeart https://www.sylestia.com/proficiency/?pet_id=5567676

Here is Skull https://www.sylestia.com/proficiency/?pet_id=5524239

the party order is GoldHeart in Slot 1 and Brownie in Slot 2 and Skull in slot 3

And can u also help me to know what types of gears to give them if you guys decide to change the pets elements and proficiency.

There are so any different ways to form a party but the way i have my lost grove party set up is this(if there were level 65).

In first slot I have an earth with 1 health 2 agility and 1 strength (when you reach level 70 and 1 more strength)
and it has all warden vinethorn gear on it (when you unlock the blacksmith shop in barracks you can level it up to make it better)

Second slot i have an air with 2 Strength 1 Dexterity and 1 Health (add 1 more dexterity at lvl 70) and it has all storm caller vinethorn gear on it

Third slot i have a light pet with 3 intelligence 1 health (add 1 agility at lvl 70) and they have all lightbringer vinethorn gear on them.

Again there are so many ways to form a party. This is a party that takes a little longer to kill something but you do not have to self heal a lot (if at all). I hope this helped! If you dont want to change elements i would recommend having just 1 health on each pet and adding the others in their other proficiencies that work for their element.

This is the party I tend to use.
Slot 1 (Level 70 Shadow Tank)
Phaeddon

Proficiency Point Distribution: 2 Health, 1 Intelligence, 2 Agility


Slot 2 (Level 70 Fire Cannon)
Acadian

Proficiency Point Distribution: 2 Health, 1 Intelligence, 1 Dexterity, 1 Agility


Slot 3 (Level 70 Light Healer)
Lynaea

Proficiency Point Distribution: 2 Health, 1 Intelligence, 1 Dexterity, 1 Agility


I sometimes use an Air pet instead of a Fire pet.
Level 70 Air Cannon
Ilira

Proficiency Point Distribution: 2 Health, 2 Strength, 1 Dexterity

All of them have either a full set of the epic (Vinethorn) Grove equipment or a combination of that and the rare (Exotic) Grove equipment suited to the element theyre attuned to.



Now, what enemies are you having the most trouble with? That might help me with giving advice & suggestions.

Goldheart:
I have two water tanks you can look at- Munir (my starter, so his stats are in the 20s) and Lahar (max stat)
On yours you'll want to replace that lv50 epic armor with a tidal lord (or warden) asap, and you could? play with the prof setup (I personally lean to at least some Str points since it makes not just the attacks stronger but the frost and surge buffs do more too, and it increases how much damage ice sphere and ice barrier can both absorb and heal)

Skull:
absolutely swap him to 3int/1dex is my suggestion. Lean towards giving him Pyromancer equips over Lightbringer, since he's not your tank (Agi = evasion and defences, which you want on a tank, dex = accuracy and critical chance, which you want on a healer. Both stats give speed.)

Brownie:
Replace the armor with another storm caller.
Put profs either as 2str/2dex or 3str/1dex.

I just in general need my pets not loosing a lot of health. I want to be able to beat the bosses that I may come across

Things will become easier as you rank up your pet's attacks, you just gotta keep grinding those attack exp out.

And with the LG bosses a lot of it comes down to just learning the strategies that come with them. Knowing when to use Ice barrier (or ice sphere once you get it), knowing when you might need to use healing, or when to block. Surviving can be pretty tough at first! But those attack ranks will come eventually- perhaps you can just swap the HP profs for damage once you get some and feel more confident against the Grove?

It will get easier, so long as you keep at it- once Skull's skills rank up it will definitely start to get easier, I think, or at least that's been my experience while I was raising my three teams. Having a ranked light pet... very handy, they heal a lot.
Perhaps when Maws of Madness open this Fall Fest you can take the opportunity to grind some rank exp there? It definitely helped me speed up the process with the two teams I was raising last year.