I've started playing this game more or less a month ago, and I've been told that this game has been around since 2021... and in 5 years it managed to get  basically just 2 game modes? That's insane, compared to another game like Raid which is made by plarium too, and got several modes over the years.

Some suggestions:

1) power core / shiny sphere  mode

a shiny sphere/core/thingy appears at the center of the arena. A mech can take the sphere by touching it. Taking and keeping possession of the sphere will score points for the team whose player got the sphere. 

- the mech with the sphere will become visible to the whole enemy team

- taking the sphere will score 1 point automatically for the team; a mech surviving while having the sphere, will score additional 1 point every 1,5 seconds

- killing the mech with the sphere will have the sphere dropped on the ground

- the first team reaching 20 or 30 points wins the match

- keeping the sphere for 3 seconds will grant the possessor the ability to get some healing when they kill an enemy mech; keeping the sphere for 6 seconds could grant additional bonus, like slight dmg increase or a bit of shield

- if a mech keeps the sphere for 10 seconds without getting killed, it will automatically lose the sphere (to avoid possible cheesing strategies); when this happens, the sphere will then spawn in a random point of the map

2) bounty mode

at the start of the match, one random mech gets a "bounty". The team of the mech with the bounty will have to protect such mech, while the other team has to find and destroy the mech with the bounty. Destroying the mech with the bounty is the only way to score points. 

- The bounty status will last 15/20 seconds. 

- If the bounty-mech is killed, or if the bounty-mech survives 15/20 seconds, a new mech will get the bounty status. If the first mech to get a bounty was a mech fo the Team A, a player of Team B will now get the bounty, then Team A again and so on

- if the bounty-mech is destroyed within the first 3/4 seconds, it will score 5 points; if the bounty-mech is destroyed within 6/8 seconds, it will score 4 points; if it's destroyed within 9/12 seconds, it will score 3 points, and so on, following this logic down to just 1 score point when it's destroyed while in its last 3/4 seconds of the bounty status

- the bounty mech could get some buffs according to how many allies are close to it (additional dmg resistance or something like that) but I'm not sure about this aspect

- at a certain point the bounty mech will receive on screen the prompt "MOVE"; the mech has to move away from its current position the farthest possible, until the "MOVE" prompt goes away. If it doesn't do so or if it hasn't moved away far enough from its current position, it will self-distruct and score points for the enemy team. This to avoid staying hidden in the spawn point the whole match

- also to avoid further lame strategies/cheesing, to  access this mode the players will need hangar configurations with at least 3 different mech archetypes and no more than 2 mechs of the same archetype (for example, a valid configuration would be 2 scouts, 2 tanks and 1 attacker). An additional rule that could work in making the fight the more equal possible, is the random pick: the first mech of each player when starting the match will be picked randomly by the game. If a player's first mech is destroyed, the player will pick the next ones to use as usual

- a bounty timer is visible on the screen, so the players know when the bounty is about to pass to a new player