I don't think the credit goes to Trump for this because his executive order on Bitcoin reserves can be repealed and the US Department of Justice can sell the Bitcoins the US holds at any time. He also never spent time pushing for the Bitcoin Act to make Bitcoin an official US national reserve, nor did he call on other institutions and governments to add Bitcoin to their reserves.
Trump has his own corporation called Trump Organization but have you ever seen his company buy bitcoin?

MicroStrategy and El Salvador were pioneers in using bitcoin as a reserve asset, and it was the SEC's approval of bitcoin ETFs that created a domino effect. Trump is just a small contributor to this idea, he is not the first person to come up with and promote this idea.