It's a lot of things going on with this president. Obstruction, malfeasance, emoluments clause violations, solicitation of foreign help in elections, nepotism, racism, cruelty, plain old incompetence. Only some of the above is impeachable. I haven't heard about bribery, personally.
For me, I stayed off the impeachment bandwagon all throughout Russia-gate. It was not really the scandal it was built up to be. However, Ukraine-gate? That one is. Once that news broke, I got on board, as did many others.