The competition for the top four positions in the standings will most likely be won by Bologna, the difference of 5 points with their closest competitor Roma makes Bologna a little comfortable for now. Bologna next match is also easy, in my opinion they have a higher chance of securing full points when facing Frosinone. Even though they act as the visiting team, Bologna has a much better level of consistency than Frosinone. Frosinone efforts to stay away from the relegation zone will most likely be hampered, it will take a lot of luck to beat Bologna.
While Roma will again be faced with a tough match, De Rossi squad will host Lazio in the next match. If Roma draw again or suffer defeat, then the competition to win fourth place and secure a ticket to the Champions League next season will be even more difficult. The most realistic opportunity for Roma now is to finish in the Europa League zone, but there is also no guarantee that Bologna will continue to be consistent towards the end of the season. There are not many matches left this season, and I am sure the competition will be even more difficult, the bottom teams in the standings could potentially create a surprise for avoid the relegation zone.
Bologna does have a greater chance of maintaining their ranking in the top 4. Bologna even has the opportunity to overtake Juventus if they are truly able to appear impressive in the remaining matches this season. However, on the one hand, if Bologna is not able to maintain their best quality, then Roma still has the opportunity to overtake Bologna because there are still 8 matches left in this season.
Apart from that, I think only AC Milan has been able to secure their ranking safely because so far they have been able to improve the quality of their game even better. Juventus is still not safe enough because their points are very close to Bologna. In the remaining matches this season we will see competition which will probably be quite fierce from several teams who want to secure a place in the top 4.