Just adding players won't solve the goal scoring issue. We scored 49 goals in 2015-16 season, then added Pogba, Mkhitaryan, Zlatan and ended up with only 54 goals. Just adding few more players who scored good number of goals elswhere is not the only solution, there is a good chance that it isn't even the solution. Adding too many players means team will always lack chemistry, new players again needs time to adapt and all that. What we have to change is how we attack, it's to do with with how Jose sets up his team.
For example, Chelsea had the same attack but added Kante, Alonso and few other defenders, their goals in last 3 seasons - 73, 59, 85.
Spurs had the same attack in last 2 league seasons, their goals - 69 and 86. Some of the other players stepped up too.
That's what we should be expecting instead of just signing few more attackers. We should be doing much more to bring the best out of players like Mkhitaryan, Martial, Rashford, Mata who are all better players than what they showed last season. I think you can also look at how Monaco did, they didn't sign any star player or many attackers but they went from being defensive team to all out attacking and their attackers did superbly (along with emergence of Mbappe).