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See:

Part I

Part II: Arrows to Alphas

Part III: Full Circle

This part is a part of a series of ideas I had. Reaching significantly past ψ(Ωω) is very hard.

EDIT: With some help with Googology Discord, I've improved my approximations.

EDIT 2: I just realized ψ(εΩ+1) is ψ(Ω2) in psi. This is more powerful than I thought after all. Ignore the title.

EDIT 3: I need to stop jumping to conclusions about approximating this.

See the rules from Part 2:

A ↑a+1 b = A ↑a A ↑a A ↑a ... ↑a A ↑a A ↑a A with b "A"s

A ↑n ★A = (A ↑n ★) ↑n A

UPGRADE:

<A,A> ↑a+1 b = <A,A> ↑a <A,A> ↑a <A,A> ↑a ... ↑a <A,A> ↑a <A,A> ↑a <A,A> with b "<A,A>"s

<A,A> ↑n ★A = (<A,A> ↑n ★) ↑n A

Recursive progression[]

<A,A>A ≈ ψ(Ωω)

<A,A>AA ≈ ψ(Ωω+1)

<A,A>AAA ≈ ψ(Ωω2)

<A,A>AA↑↑A ≈ ψ(Ωψ(Ω))

<A,A>AA ↑A A ≈ ψ(Ωψ(Ωω))

<A,A>A<A,A>A ≈ ψ(Ωψ(Ωω))

<A,A>AA ≈ ψ(ΩΩ)

<A,A>AAA ≈ ψ(ΩΩ+1)

<A,A>AAAA ≈ ψ(ΩΩ+ω)

<A,A>AA<A,A>A ≈ ψ(ΩΩ+ψ(Ωω))

<A,A>AA<A,A>AA ≈ ψ(ΩΩ2)

<A,A>AA ≈ ψ(ΩΩωω)

<A,A>A↑↑A ≈ ψ(ΩΩψ(Ω))

<A,A><A,A>A ≈ ψ(ΩΩ2)

<A,A><A,A>AA ≈ ψ(ΩΩω)

<A,A><A,A><A,A>A ≈ ψ(ΩΩΩ)

<A,A>↑↑A ≈ ψ(ΩΩ2)

(<A,A>↑↑A)A ≈ ψ(ΩΩ2)

(<A,A>↑↑A)<A,A>↑↑A ≈ ψ(ΩΩ22)

<A,A>↑↑AA ≈ ψ(ΩΩ2​​​​​2)

<A,A>↑↑AA ≈ ψ(ΩΩ2​​​​​ω)

<A,A>↑↑<A,A>A ≈ ψ(ΩΩ2​​​​​Ω)

<A,A>↑↑<A,A>↑↑A ≈ ψ(ΩΩ2Ω2)

<A,A>↑↑↑A ≈ ψ(ΩΩ3)

(<A,A>↑↑↑A)↑↑A ≈ ψ(ΩΩ3Ω2)

<A,A>↑↑↑AA ≈ ψ(ΩΩ3​​​​​2)

<A,A>↑↑↑<A,A>↑↑A ≈ ψ(ΩΩ3​​​​​Ω2)

<A,A>↑↑↑<A,A>↑↑↑A ≈ ψ(ΩΩ3​​​​​Ω3)

<A,A>↑↑↑↑A ≈ ψ(ΩΩ4)

<A,A>↑↑↑↑↑A ≈ ψ(ΩΩ5)

<A,A> ↑A A ≈ ψ(ΩΩω)

So after that, <<A,A>,A> is easily definable similarly to <A,A> and can be iterated similarly.

<<A,A>,A>A ≈ ψ(ΩΩω)

<<A,A>,A><<A,A>,A>A ≈ ψ(ΩΩψ(ΩΩω))

<<A,A>,A>A ≈ ψ(ΩΩΩ)

<<A,A>,A>↑↑A ≈ ψ(ΩΩΩ2)

<<A,A>,A>↑↑↑A ≈ ψ(ΩΩΩ3)

<<A,A>,A> ↑A A ≈ ψ(ΩΩΩω)

<<<A,A>,A>,A>A ≈ ψ(ΩΩΩΩ)

Limit: <<<...<<<A,A>,A>,A>...A>,A>,A> ≈ ψ(omega fixed point ) (commonly denoted as ψ(ψI(0)) but pbot doesnt like that smh)

This isn't over.

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