It is obvious to me that the best way to strengthen people's interest in the EUROPA Cup is to stop third placed losers from being parachuted from the Champions League and get rid of the the league system so it becomes a straight knock out competition
Thinking about it, removing the habit of dropping losing Champions League play-off teams into the group stages would be a start: the key being to reduce the number of teams in the competition to the level where the extra knock-out round prior to the quarterfinals is removed. 8 Champions League third place teams being parachuted in is probably necessary to keep viewership up and advertisers onside, but it's unlikely that the CL teams that don't navigate the playoffs (usually unseeded ones) will be interesting enough to the advertisers for them to insist on their inclusion. The aim should be to reduce the number of qualifying teams (for the knockout stages) from the present 32 to just 16, to remove the extra knockout round and streamline the competition to have as many games as its bigger European counterpart. Since the 8 CL drop-in number is probably fixed for now (until they reduce the number of CL contestants to streamline that competition as well, perhaps by removing 4th/3rd place qualification), that means only 8 qualifiers from the group stages. That in turn means less qualifying teams from the knockouts (probably 16 or less, instead of the present 22) ad a reduction of the overall number of teams in the group stages (from the present 48 to 32). However, a 32-team group stage would still present you with 16 qualifiers for the knockouts, which when added to the 8 CL drop-ins creates an unsustainable number (24): therefore, that has to be reduced even further (to 16 teams, an unprecedentedly low number)...
...or, conceivably, to only have the winners of the groups go through, with the seeded/unseeded calculation for the knockout round draw that would follow being removed and teams randomly drawn against the CL dropouts. I like this option the best, since it firstly makes the group games really matter from the perspective of the team trying to go through and the team chasing them (the teams in 3rd and 4th won't be as interested, but that could be remedied by adding a large financial incentive and European coefficient bonus to finishing 3rd instead of 4th): secondly, it ensures that the best teams are selected for the face-off against the CL drop-ins, and thirdly, (critically), it reduces the number of teams in what is at present an unfeasibly large and unwieldy competition.
Michel Platini fudged up the competition by insisting that any two-bit team from Outer Siberia be given a spot in the group stages, and by expanding it to include an unprecedented number of contestants, CL dropouts and fair play winners. That needs to change.