What to use to seal naturally distressed painted floorboards?

We have a floorboards which were originally painted with white paint which has distressed in places over time and we'd like to preserve the distressed look it now has.
What kind of sealer/ top coat would be best to use? We don't want to sand down the current floor as we want to keep the remaining paint in tact.

Advice from 2 local tradespeople

I would use a top varnish to seal it

Prepare Your Space. Start by laying down drop cloths and preparing the area. ...
Sand and Clean the Piece. Sand the surface of the piece. ...
Paint the Piece. ...
Apply Wax and Top Layer of Paint (Optional) ...
Distress the Piece with Sandpaper and Steel Wool. ...
Apply a Stain (Optional) ...
Protect the Finished Piece with Polyurethane.

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