I mean ublock origin is really all you need imo so I guess one

Please never do this! Read this thread from the developer of uBlock Origin. Using multiple content blockers together like this can and will cause issues, as well as will increase fingerprinting, etc, and there's no gain or benefit at all from doing so.

I would disable Brave's built-in ad/tracker blocking (leave the rest of the Shields' functionality enabled), and would solely use uBlock Origin, and remove the other extensions. (You could even just stick to Brave's built in ad/tracker blocking if you want to, but I just prefer uBlock Origin for its advanced features and compatibility)

As far as Decentraleyes goes, its essentially abandoned. You can use LocalCDN instead if you wish to do so, though its privacy benefits are debated. I mainly use it since I use uBlock Origin in Hard mode (which it complements uBo very nicely in both Medium or Hard Mode), and for the performance boost it gives, but its up to you. Ghostery and DDG Essentials should definitely be removed. (While DDG Essentials isn't only content blocking, its other features are also just completely redundant and unnecessary with Brave)

I use the extensions based on the Arkenfox user.js wiki. He describes what's obsolete or redundant, etc. It's a good quick read.

Brave is trash and its owned by an asshole. I use adblock browser in my phone and Firefox otherwise. Not sure about the owner or Dev or whatever, but it's much better quality for blocking ads.

An answer to the more pertinent question of how much is too much, however? None. There's no such thing as too much ad blocking.

You just need uBlock. The other add-ons are redundant.

You can have what Brave does except block ads/trackers, which uBO can cover anyway, but on Firefox or Librewolf instead. For extensions, ditch Ghostery.

My rule for this is if tor uses it its pretty dam good aka No script + Ublock Orgin

Use Firefox with ubo. Stop using chromium browsers.

Ditch ghostery and replace with privacy badger.

With brave you don't need any of those addons.

On Firefox just uBlock is fine.

Just one is too many. The goal is to blend in not stand out. Use Mullvad Browser and Tor Browser.

You don't need any of those.

The functions and lists of uBlock are built into Brave. Most of the rest are redundant. You're just having the opposite effect that you're trying to achieve. These extensions are just used to fingerprint you.

Websites can also dingier print you by your browser settings and extensions.

So, having a lot of extensions can defeat the purpose of privacy.

I try to keep default settings and a minimal number of extensions.

Yup. Overkill. But, thankfully extension removal is just a click away. More users should ask questions like this.

I've tested a few browsers using Eff's Cover Your Tracks website. The best is TOR, but Brave with no extensions is second, it said it provided a randomized fingerprint. Tried it with Firefox with uBlock and it said my comp had a unique fingerprint. Mullvad browser faired slighty better, cant recall the score, but at least it wasn't unique. I tried it with Librewolf also with a load of extensions and it was a poor score as well. So, imo, you don't need extensions with Brave. I think my settings are the same as yours.