I can't fathom willingly entering the web mines if you've already sunk in the hours to master high perf native code, OSdev, dist systems etc. People usually enter web to avoid having to learn such things.
To discard that knowledge and instead compete with an endless stream of fresh grads, boot camp grinders and LLMs for less money? A madness if I've seen one.
Web tech is more immediately rewarding. With C++ (and especially with modern web dev agile processes), you can spend a week building enough framework and infrastructure crap to stand up the barest inkling of a demo of the solution you plan to implement, only to have the whole thing pivot out from under you and become wasted work.
More complicated languages and frameworks that manage memory and do UI and everything for you let you get to a prototype much faster, so you can see whether it'll work or whether you want to toss out the idea much sooner.