With a 2080 ti I'd personally step up to the 10600k rather than a 10400F.
The 104 will give you a modest uplift, maybe 3-15%. With 106 (or 116) you'll be looking at a 10-30% uplift, which in my opinion is more worthwhile of an upgrade.
Honestly I'd be concerned that you'd still not be taking full advantage of the 2080 ti in all titles.
Thanks, but that's starting to go down the road of building a new system where I was considering getting more value out of stuff I already have.
I've also got a 10700k and 3090FE. I'm leaning towards putting the 2080ti back in with the 10700k and selling the 3090 while the prices are inflated and parting out the older PC less a few bits I want to keep.