Answer:
1. Julius Caesar conquered many lands for Rome which made him popular.
2. He killed Pompey so there was an opportunity to seize power
3. The senators that publicly spoke against him were silenced.
Also Crassius was unpopular among the citizens of Rome so he wasn't an obstacle. (Until Crassius and his conspirators stabbed Caesar lol) With Crassius unpopular and Pompey dead, Caesar was able to get power.