Your meme is brimming with outright lies
In 2017 China became a net seller of US Treasuries and later started talks with Russia about using a currency other than the US Dollar. EU countries had also become net sellers of it as well, collectively actually having had been bigger buyers of the $ than China. These were over concerns about possible instability under Trump.
Obama wasn't President then.
In 2014, in response to sanctions because of it's invasion of Ukraine, Russia started selling off $$, as well as Euros (remember when THAT was supposed to be the replace the USD?).
Anyways, sure, Russia seeks other options for obvious reasons, but the Ruble is a joke, so therefore not an option, and the Yuan has problems as China restricts trade in that in order to keep it weak abroad to maximize gov't usage domestically. That keeps Russia in permanently 2nd tier in this shindig, and subject to the whims of China. This partnership has already meant for Russians having to pay more for Chinese goods.
https://www.atlanticcouncil.org/blogs/new-atlanticist/russia-and-china-have-been-teaming-up-to-reduce-reliance-on-the-dollar-heres-how-its-going/#:~:text=In%202014%2C%20Russia%20made%20a,new%20yuan%20currency%20swap%20instrument.
Saudi Arabia says it's open to trading in currencies other than the USD. It is not dumping it.
Biden has been having the Fed increase key interest rates in order to slow inflation, which has strenghthened the $. Trump wanted rates to go into the NEGATIVE! Literally pay big business to borrow!
Obama had also strengthened the USD, after years of W Bush weakening it ostensibly to stimulate the economy but also as a way to offset debt incurred over two big expensive ongoing wars that weren't being paid for.