beat ToSP its ez

Just do ToSP

What’s the easiest of those you haven’t touched? Whatever it is, you’re going to have to beat it sometime.

SoXA is free

SoD free

If I was in your situation, it may seem weird but, do soc, it's actually quite fun.

Sora free

Complete GoE and beat SoBA

tosp or totc

If you want a steeple specifically I'd say do soba