Export content clean from short-codes?

I’m afraid this isn’t going to happen. You have a shortcode based layout here.

For example, if you use a multi column shortcode plugin, and then want to go back without using shortcode afterwards, that’s not possible either.
With text blocks it may still be relatively easy, but with pictures and media elements and and so on. pp ? no

May I possibly know the reason for your change? Maybe there are solutions for the “separation decision” and you can stay with Enfold.

if this is the only reason: https://kriesi.at/support/topic/enfold-v4-5-3-not-working-with-wordpress-v5/ – there are solutions for it. All my Enfold installations are now on Enfold 4.5.3 and WP5.0.3 – and everything works fine as it should.

But a subscription is not nedded for the theme. This is a lifetime license. Only the support is limited to a certain time. Personally I haven’t experienced that yet, however, that after the expiration of the time one is deleted here from the board – or no more write permissions would have.

There has only been some confusion since the introduction of the Gutenberg editor in WordPress 5.x, which I personally completely block for Enfold. Meanwhile Enfold also offers this option to use the Classic Editor as default.
The Advanced Layout Builder (called ALB for short) is exactly the ingenious thing about this theme – and in principle a unique selling point. I don’t know of any WP theme that is as intuitive to use as this enfold. I have also been very busy with Divi, but find it by far not as pleasant to use as Enfold.
Maybe you should give it a chance, because the learning curve is very steep.