I quite agree with you with what you said about Juventus finishing on the top four, Lazio's last match really gave Juventus more hope in getting to top four. Still both teams are are not in their best performance. There are only two points in between the two teams, it seems small but difficult to overcome, both teams lost their last match and that didn't sound good, Lazio started this journey well which makes me have confidence in them but along the line they tend to decrease in performance. Since there are still many matches to play maybe they can improve before the season runs out and retain that position.
There are three other teams that I think also have a chance to finish in fourth place in the standings, namely Fiorentina, AC Milan and Bologna, with a fairly close points difference between them and still many matches ahead, the three teams also have a chance to overtake Juventus and Lazio. Meanwhile, when looking at the Serie A standings, most of the teams in the European zone have only managed to win one of their last five matches, except for AC Milan. Therefore, the competition to get a ticket to the Champions League seems fiercer because it involves several teams at once, rather than the competition for the Scudetto which is only seriously contested by Napoli and Inter Milan, while Atalanta is starting to look left behind. Regarding Juventus, it seems they really need to change their manager in order to be more consistent, Thiago Motta looks really overwhelmed.
Bologna would have to improve their game by a lot or otherwise I don't see that they've got the capacity to go all the way to the top four this season.
For me Napoli and Inter are save first two unless something unforeseen happens, but even then I think they are sufficiently ahead in terms of the quality of their game to maintain the gap and finish top two.
Then the field is wide open and I am quite sure Atalanta will make it and as for Juventus, it depends whether they finally start to win several games in a row or whether they will keep having all these draws.
Bologna is not quite a top four team yet and they would have to benefit from several other teams to struggle. Since Milan and Bologna both have a game in hand, maybe they can close the gap with that game and it looks closer again. But AC Milan is also struggling and they can't find the well needed winning streak.