HE cleared their Discord, so you need a new invite. I'm personally not in it but
I can give you the Discord of someone who can invite you.
Edit: HyperElk no longer exists, don't DM me asking for an invite. They're gone.
Since their ban wave, they went "private" only allowing certain slots + increasing the price.
As for current rotation bots, I personally use GGL as this, in my opinion, is the safest option. I've used them for 5 years, multiple R1's, multiple Cutting Edge, 3K+ io, etc. However, it has a substantial initial investment.
If you want something cheaper, more hands free, and undefeated in arenas, something like a WASD rotation from NerdPack is a great choice. The only downside is that internals are ban heavy and usually see anywhere between 2-5 ban waves per season.
You can use this read as a reference point -
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