Its not finished.
In essence.
Set the walkable to 70 or so. 90 if you want to always manage it yourself.
Hook the tick even into the capsule component find floor result. Check the slope from the impact normal.
decide what to do.
you can normalize and apply the impact normal as x2 to the input to get the character to move away.
combine this to a slope animation and thats that.
Making the chatacter fall is a different conundrum.
If the slope is higher then 55 or so just ragdoll. (How you do it is up to you. Physical animation being the best imho).
getting up ON a sloped surface is the complicated part.