IME what works best getting new projects kick started is hiring a very small team of senior freelancers, making one of them lead, and letting them loose. I worked on such a team once and it was really excellent. The advantage of this strategy is if the experiment doesn't work out, terminating freelancers is much easier than permanent (I noted you're based in Europe). Contrary to what other people said, I wouldn't try…
I’d love to do that again. It was by far the most fun I’ve had working on software. These days I do pretty boring work that’s significantly below my capabilities, but it pays the bills and there’s not much else to pick from at the moment.
As for if someone hypothetically did choose to build a new solution in this scenario, it would almost certainly make sense to build it in tandem with your existing process. Going totally greenfield and trying to port your business over in 6 months would be misery. I’d look at ways to incrementally build a new system which you adopt gradually, probably starting with replacing the no/low code pieces you’ve already built.
Any kind of monolithic approach to replacing an existing system gives me deep, deep tingly creeps due to past disasters.