The Supreme Court, which has a Republican majority, several appointed by Trump disagrees with you. States that used optional means of voting that were already "on the books," and legal under their laws is not changing the rules. It is adapting to meet the challenges faced by citizens trying to exercise their Constitutional right to vote. Some 50-lawsuits alleging what you do were heard by various judges, many of them Trump appointees. Not one of them supported your position. Just because your guy lost, bigly, does not mean that all the states you wanted him to win cheated. It just means he lost. Period.