Is there a way to completely turn off iCloud on my Mac???

I only use iCloud for Find my Mac on my phone and on my desktop and I recently upgraded to a new Mac studio M4. I'm just having all sorts of problems with iCloud, and I'm just wondering is there anyway that I can turn it off completely on my desktop? There probably isn't, but I'm hoping there's some solution. I can always use find my Mac on my phone, but because I'm using the same Apple account I'm probably screwed. Any suggestions or advice would really help.

Not an expert, but this is my fifth or six Mac and I've never had problems like this before, every time I boot up my computer iCloud items start getting turned on automatically without my permission. I go turn them off then it keeps happening; my photos, my passwords, my messages, etc. I'm an amateur photographer and I have 90,000 photos and if I could go back through time I would've just used Lightroom, but I've been an Apple user for so long, I started in iphoto, now I'm trapped in its revolving **** of iCloud.

Thanks for any advice,

Rob