@David *************
would depend on your visa/entry history. Presuming you don't have one before now, it won't be a problem crossing into Laos at the Chiang Khong/Huay Xai border and coming straight back. If you have a history of COVID extensions or volunteer visas, different considerations.
Jo is right but only the if you've already done one or two bounces (including flying out and then coming back - there's a limit of two per year at a land border), then you really should take a break before returning.