It seems most likely they will try several things with the electoral college and the final ratification in January. However, with him having such a strong win, and with Kamala's weak showing, they have much less of a chance of pulling it off.Nothing is certain until Trump takes the oath of office in 2 and half months on 20 January.
Also if Biden resigns, or dies, before then, Kamala still becomes a temporary president.
I would expect them to try to kill him again. I'm not sure how it works if they succeed. It would make sense to put Vance in, but it's much less clear before he is inaugurated.