Prior to the election, Donald Trump incited the Proud Boys specifically and other militant groups to insurrection with his 'stand back and stand by' comments. These were taken by many observers and the Proud Boys themselves as calls to seditious conspiracy. Members of the Proud Boys then planned the 6 January attack, including planting bombs around Washington DC, and were involved in the attack on the Capitol. Many have been convicted of this conspiracy, so there's no legal question as to whether it happened. I don't know if incitement to an insurrection counts as insurrection in and of itself. It might do, but I'm not a lawyer.

Having lost the election, Trump knowingly engaged in a conspiracy to undermine a free and fair election, which he knew he had lost, in order to keep himself in power. Some aspects of that conspiracy have gone to trial and defendants have been found guilty. So, there remain some legal questions as to the extent of the conspiracy, but it is quite clear that people involved broke the law in the pursuit of the conspiracy. The conspiracy constitutes an attempted insurrection in itself.

When his conspiracy failed, he then incited a violent attempt to overthrow the election (the 'fiery stuff to a rally') and allowed it to continue as people were violently attacked. This also constitutes an attempted insurrection.