I can't imagine Trump actually running for either the House or Senate - he would loathe having to share the spotlight with 434 other Congresspeople or 99 other Senators, and would probably spend most of his time at his golf course (pretty much what he did as POTUS). He wouldn't enjoy being Speaker either, as he has no idea of what the job entails and no ability to guide debate on the floor. He's far more likely to just push for Biden's impeachment from a distance if the GOP wins a House majority in 2022, as they are highly likely to do. I could definitely see Trump resuming his campaign/political rallies as soon as possible, as he just loves the attention and adoration (and sweet donations) he gets from his flock. But if he runs for office again it will be for POTUS and nothing else.
ETA: Not to mention that he will see any political office other than the presidency as a demotion, and thus his ego would never allow it.