You say he’s committed high crimes. You’ve listed them all. You’re 100% sure he committed a crime, so why hasn’t he been impeached yet.
That's like looking at a guy who is in jail waiting for the charges to be laid and saying, "well why hasn't he been convicted?". Trump committed crimes. Trump is getting impeached for those crimes right now.
As for why it hasn't happened before now, it's because the democrats suck at getting information across. The mueller report showed trump committed at least 8 counts of obstruction of justice. But they really sucked at explaining that. So trump was able to win the narrative by just repeating "no obstruction" over and over and over and people just believed it. If you can't convince people that a crime occurred, then going forward with impeachment would be reckless.
But now the crime(s) is quite clear. The crime is easier to understand for people who are only kind of paying attention. The question is just "did trump ask Ukraine for dirt on Biden?". If yes, then he committed a crime. Since we already know for certain the answer is yes, that is an easy case to make. So crime #1 is certain.