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You can't upgrade different cpu socket 1800x is am4 and 9700x is am5. You could upgrade to something like 5800x if needed.

I went 1700x -> 5700x on a lark, because it was really cheap.

I wasn't expecting much & wasn't sure why I was doing it (I do some occasional gaming but my rx580 is almost certainly the bottleneck). I was pleasantly surprised to find my computer noticeably snappier.

There are used 5800x's under $100 on eBay. I would absolutely recommend grabbing one of those. At $200+ (what I paid) it's nice & I was pleasantly surprised, but man, these things were already pretty fast!

I believe the 9700X would require a new board with an AM5 socket and only accepts DDR5 RAM so whole enchilada.

You can upgrade to a much better AM4 CPU for very cheap (used)

Buy a 5700x3d for a cheap upgrade.