vege/tomato garden issue - I am gROOTS

[kvet]

Hi:
I'm pretty sure I have rediscovered the problem why our veges begin okay then just don't grow (I suspected this last year in 2022), and I have no idea what to do. No clue what these roots are, but do suspect raspberry or blackberry though.

The image with all the roots is me simply moving my hand around in a 1-2ft circle and collecting the roots from the soil in the pictured raised bed. The clay-lump lifted by fork is from a different sort-of-raised bed. It's the main one, I forgot to snap a photo of it.

First thought was weed cloth then 6-12" fresh soil on top, but that seems temporary with roots eventually growing through it anyway and the plastic breaks down.

Abandon these beds? Convert to container grown?