That drop from upper Gold to Silver I is frustrating, but it is usually less about one bad stretch and more about consistency. What helped me most when I was stuck in a similar spot was narrowing my champion pool to one or two picks I actually knew well, instead of swapping every game to counter-pick. That makes it much easier to focus on the fundamentals: staying alive in lane, keeping vision up around objectives, and playing around whichever lane is actually winning instead of trying to save a losing one.
I would also look at your own deaths first when you review a loss. If most of them come from overextending without vision or from team fights where you arrived late, those are fixable habits that will show up in almost every game. And after two losses in a row, taking a short break helps a lot. Queuing tilted just turns a bad session into a worse one.