Worth is something only YOU can determine.
From the reviews I have seen, at 4k the primary performance limiter is the gpu for fast action games.
For cpu centric games like strategy, mmo and sims, the cpu could well use an upgrade.
As a test,
Run YOUR games, but lower your resolution and eye candy.
This makes the graphics card loaf a bit.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.
Run the cpu-Z bench and look at the single thread rating for your 10700KF.
You should get a number like 549:
https://valid.x86.fr/bench/7gp430
13700K will be 864
If you do go to 13th gen, you will also need a lga1700 motherboard and a cooler adapter.
You can reuse your ddr4 ram.