My suggestion would be to change /competition entirely, instead of /competition increasing in points after every week, it should stay the same every week but instead the value of the points should rise. for example:
1 point in current /comp is worth 25M value and stays like that forever
the new version should work something like this: 1 point should be equal to 1M is value
by next week it should be worth 2M
the week after that 4M, etc goes on. this will make /comp one of the base challenges to take an island to /is top instead of it just being afk, grind, buy more spawners, repeat
This will also have additional buffs such as new islands would finally be able to beat higher islands, instead of them just buying 100+ spawner gkits and grinding /is top every time.
And on an side note, maybe change /competition to some other different kind of challenges too instead of just grinding, maybe make it something like /levels for example: whoever harvests most wheat etc