I've had a lot of wrist issues, between biking/skating/snowboarding. Years ago I tore my a ligament in my thumb (UCL - skiers thumb) on a front wheel case of a big stepdown jump, hand pushed forward while thumb was hooked on the bar/grip. Got up and I could pull my thumb down to my wrist and was like "uh, that's not good...". Had surgery, cast for a while, finally green light to ride again and somehow managed to tear it *again*. Had a second more involved surgery but a more permanent fix (using a "donor" tendon from this extra one in my arm - palmaris longus, supposedly like 85% of people have this essentially vestigial thing). After that second surgery (and being basically out of riding for like a year total) I was on a quest to find a thumb/wrist brace that I could ride with. I was like, I am NOT gonna go through that again. I even managed to have my insurance cover a pair of super-expensive carbon Allsport Dynamics braces, but to be honest after trying practically everything I've been happiest with these cheap braces on Amazon:
https://www.amazon.com/gp/product/B000JNPIMS
I make a couple mods to them:
- There is a sock-like cotton material covering the inner forearm. I just cut that all out, as it's just a sweat sponge.
- I remove the thin aluminum stays for the thumb and along the inside of the wrist, leaving only the main thick aluminum under-wrist stay. There's enough support for my thumb from just the straps, and removing those stays gives it enough mobility to be comfortable on all-day rides.
I wear those braces on EVERY ride now, only taking them off for extended climbs. Just like pads - the only time I get hurt is if I don't wear them.

I recommend them to everyone these days. Even if they don't have any wrist issues currently... because if you mountain bike it's just a matter of time. These things generally seem to last about 6 months of solid riding before the stays start ripping out or they're otherwise toast. But they're cheap enough that I stock up on a few pairs so I always have a set in reserve. There is also a version that is just the wrist brace w/o the thumb splint, but honestly after taking out the thumb stay it's not that intrusive and it will help prevent a thumb injury so why not.
While we're talking about injuries and helmets... aside from that surgery I had a pretty good run of not banging my head until a few years ago when I woke up in the hospital with no idea how I got there. I pieced it together later from GoPro footage and other spelunking: ~30 foot stepdown gap into a berm, washed out in the berm and over the edge into a tree, which fortunately I just grazed and didn't hit head-on. Some guys found me sitting there like an hour later and totally out of it, apparently I rode out of there with them to their car and they drove me to the hospital but I don't remember any of it. The funny-in-retrospect thing about that particular incident was that it happened 3 weeks before I was supposed to go heli-boarding in AK. There were some hairline fractures of some bones in my face that they were concerned with, so I followed up with an ENT surgeon. After he determined no surgery was needed, I was like "uh, so I'm supposed to go heli-boarding in AK in a few weeks, is that a problem?"

The doc goes, "well, I can't tell you not to go... but if you do go, don't fall on your face!". (I went; it was awesome)
Then last year had a kinda similar situation where I was sessioning some jumps, then came to sitting on the side of the trail somewhere else wondering WTF happened and thinking damn my face kinda hurts. Took a selfie to see if there was any obvious injury and saw this :eekster:
Got a CT scan and had a "zygomaticomaxillary complex fracture" (look it up), same kinda thing you would get if you were punched in the face in a bar fight. Normally that involves reconstructive surgery with plates and ****. Actually same bones that had only hairline fractures in the previous incident. Fortunately in my case it was minimally displaced so no surgery/plates needed. Or maybe the doc just thought there was nothing he could do to fix my ugly mug. Got the CT scan on disk, it's kinda fun playing around with 3D models of your own skull:
Best I can figure I crashed on one of the jumps and took the handlebar to the face. I was wearing a full-face helmet and googles, so there was only a specific angle that something could have hit me at and caused that damage, and the handlebar fits the profile. I since switched to different goggles with a stiff impact-resistant lens, the ones I was wearing bend easily and don't provide any impact resistance.
The helmet I was wearing at the time (Bell Super 3R with the chinbar) was toast, so this time I upgraded to the Super DH. It is waaaaay better IMO. Definitely more substantial chin bar. Full DH certification. Also, the OP asked about MIPS. The Super DH has their rotational MIPS which is a whole different beast from regular MIPS and really seems legit. The entire inner foam helmet "cap" can rotate within the external foam shell. It's really slick. It does make some creaking noises when riding as things move around which generally bugs the crap out of me, but I suspect that can be fixed with strategic placement of wax or some pieces of soft-side velcro.
OP, replace that helmet. Please.

Yours actually looks worse than mine did after both of the above 2 incidents.