Stickers: how to re-stick them?

[Veynom]

Hi,

I could not find a definitive answer to this. I have some stickers of recent sets (like SW Venator or V-Wing) that already start to unstick.

So my question is simple: how can I re-stick them (or re-glue them) ?

Plastic glue is not an option (even if plastic glue is a wonderful option for repairing bricks).

Any hint welcome.