The two teams that Manchester United will play against in the next two matches are not stronger than Manchester United, so if Manchester United can perform as well as they did in the last Premier League match in the last two Europa League matches, they will surely get full points in those two matches.
Since Manchester United is a big team in the European League, they need to perform like that to ensure the next round. If Manchester United secure the next round, the pressure will increase on them and they will hope to perform better in the Super Sixteen with tough pressure. Even if United don't win the Europa League title this season, I'd like to at least see this team in the semi-finals or the final. Even if they qualify for the semi-finals or finals, I'd say they've performed to their credit.
Yes, a team like Manchester United should be able to beat both teams which can be said to be small clubs, but what makes me doubt Man United is that sometimes their performance is erratic, sometimes good and sometimes their performance is very bad, so their good performance against Liverpool actually cannot be used as a reference it will remain the same.
However, I really hope that Man United can advance further in the UEL when they have qualified for the last 16, the challenges will be even greater and the possibility of their opponents will be even more difficult.
"Should" isn't always the same as "will", they should but they also lost points to teams that aren't that good neither. However, I feel as if they could win these both games, and they could get good enough points to maybe even be in the top eight, that will be a good indicator that they may do fine this season. Of course this isn't a simple thing because even if they do that, they still have to play last sixteen, then quarter finals, then semi finals, and a final game.
All of these are a lot of games and they may lose any of them and leave, that's why it's very important that they end up doing better rest of the season as well. They should seriously consider about some additions to the team this transfer window, they are considering many deals but haven't done any, if they want to win this title then they need to do some transfers before it's too late.