3DPrinting

Also tinkercad. It's basic but honestly it works for most stuff I make for things around the house.

Fusion 360 is free for non commercial use.

My solution to the same issue was OpenSCAD. But it might not be for the faint of heart. For me, this is a godsend, working 100% in my mindspace.

Try freecad as a flatpak maybe ? Doesn't crash for me unless I do something stupid with fillets. It's harder, tougher to use than paid options but you own what you make at the end.

There's an entry missing in your list, which many people seem to not know about: Siemens Solid Edge

Like fusion, is free for personal/hobby use. But it's not "cloud based". Also unlike fusion, they aren't constantly scaling back what you can do with the free edition. Probably worth a shot.

I've been using progeCAD for the last few years and its basically a clone of AutoCAD for a fraction of the price and you own it unlike autodesk's model they've had since like 2017 or something.

Blender has addons for parametric workflows. Actually, there's plugins to do anything you want.

I recently looked into (affordable) Linux-CAD programs and stumbled upon VariCAD, which, checking their presentation, appeared pretty complete. Saying that I would just make a decision after throwing a serious project, multiple parts, workgroups, parameters and technical drawing generation, on it. Maybe someone can comment on it?

Blender has an add on project called cad sketches in development. It's free to use and is donation supported just like Blender is. I haven't used it myself but it wouldn't hurt looking into it.

https://www.cadsketcher.com/

I liked TinkerCAD.

You can save files in fusion 360 locally. It's just not the main way the program encourages which sucks.

I think you have to like export instead pf save but you do get a .f3d file which is the same as what gets saved to the cloud.

Onshape would be ubiquity. Easy to use, flash, has all the good bits, ripe to screw the customer at any moment once enough lock in is gained.

Depending on your system I think, I have been using Sketchup 2017 (whatever the last free version was they released) for years to make 3D models for all kinds of purposes, incl 3D printing. For my brain it has proven to be the most intuitive tool to learn, it’s been a really long time so maybe I have forgotten but I feel like the barrier to entry was pretty small. There is a lot of content out there from people giving tips and tutorials. There are plug-ins still flooding around that have really good functionality. I use it with a Connexion 3D Space Navigator mouse that’s prob 10+ years old. That’s been a godsend and adds so much efficiency and flow to the tool.

I don’t know if you can still download it from Trimble but there are sources for it elsewhere.

Have fun, whatever you choose.

I use a free version of sketchup make from 2008. You can still find it out there on the internet for download.

I personally like OpenSCAD (with VSCode not with the built-in editor)

I saw a bit ago that blended has an addon or plugin or something that adds parametric functions

I think I got the impression it's less powerful that proper parametric cad or something, but I figured I'd mention it in case that makes it a more viable option for you!

Fusion is easiest to get going for 'serious' projects as a beginner.
I will use it while I can, or until an equal alternative is available. Nothing lasts forever.

I will be blunt. If you are as bad at math and spatial reasoning as you say, then CAD probably isn't for you. You will always find it difficult and unrewarding. Design and engineering require a mindset you might not have.

As far as "cheap and easy and professional" CAD they ALL require effort to learn and money to gain entry for commercial versions. CAD is a skill and skills require effort to acquire. And it sounds as if you have no desire to put in very much effort.

For a CAD program to meet your want of cheap and simple, (professional means a lot of money and takes more than a few minutes of effort), look at TinkerCAD. It's free and simple enough that I teach that to 5th and 6th grade students well enough for them to make simple objects. Ain't nothing wrong with starting there and learning how to think about design and CAD before you might try and step into more demanding software.

I haven’t used it but there is also tinkercad