A websaver YYZ LAX will get you very close. You 'll need to stay over one saturday night and slightly more than 4,000 points.
I did YOW LHR earlier this year, (about 6,500 points) using the Arrivals Lounge and MLL to freshen up (no hotel bills, no need to stay a week as is common for intercontinental fares). But I was grilled by Canada Customs on my return, and anticipate in the current situation the grilling would be more intense. (Customs officers don't 'get' the idea of a mileage run.)