There is only two ways to achieve that
a- we spend ridiculous amount of money on fees and salary. Which we tend to do but we'll never be able to go toe to toe against Shitty and PSG
b- we start winning serious trophies and that means CLs and EPLs not the mickey mouse cups like UEFA cup, FA cup etc
Apart from that, we're stuck back to the buying bargains/players who are off the radar in the hope we can sort them up. SAF did that magnificently up until he allowed sentimentality and outdated valors clouding what is important ie build a great side which will dominate the EPL for years to come
In my opinion, United's biggest problem is that we try to reinvent the wheel. Instead of opting for wingers who are filled with trickery and pace we opted for either slow pokes (Mata, Mkhitaryan) or talentless players (Lingard, Young etc). Since these sort of players will never do well with United in that position we're resorting to playing strikers with pace on the flanks instead (Rashford and Martial). That's silly. If we had Salah and Mane on the flanks (who are neither Messi nor Ronaldo) we would be seriously competing for the title.
That's flawed attitude is not reserved only for the flanks. I've yet to understand why
a- we bought the likes of Darmian (he's useless), Blind (too frail in CM, too slow as full back, too short as CB) and Rojo (where should I start on that one?)
b- our only cover for Matic is a former player in all but name (we might as well brought Robson out of retirement)?
c- we kept Ibra for another year after the terrible injury he suffered?
Our team is beyond the hilarious with our best full backs being wingers, our best wingers being strikers and our second best DM being a box to box midfielder. God what I would give for a young heartless SAF who would shake the team around, remove any scrap of sentimentality from OT, bring us back to our basics and kick those who aren't good enough out of OT.