I'd suggest all you dealers and manufacturers give out bikes for free to people who've done more than 2517 miles since May
in return, i'd tell everyone that they should buy one!
(the only flaw in this genius piece of marketing strategy is that i already do tell everyone to buy one....)
(and yes in case you're wondering, thats why i have a marketing director

)
In all seriousness though, the problem with ebike uptake is that the bikes are too expensive to simply take a punt, so you're looking for someone who has made the decision to spend some serious money on a bike AND who hasn't taken that decision on the basis of simply enjoying cycling and wanting to get serious about the area they enjoy.
I'm surprised no one leases ebikes to commuters to be honest, if you could make it <50% of the price of the tube/rail pass, i reckon you'd get people taking a chance - which is how cycling grows, people buy cheap bikes, then upgrade.....
of course you didn't ask me the question, but i always like to do anything i can on a Friday to avoid the work i should be doing.
I do think you are doing one unique thing right, which is holding stock of bikes to sell, so many of the bike shops i visited didn't have sales stock, only test stock, and as such, they lost my instant sale potential....it won't help with the thinking researching buyer, but for impulse purchasers like me, when i found a shop that had bikes that both me and the misses liked and could take home the same day - i blew my budget to the tune of 250%

similarly when the bikes i wanted weren't in stock or available to buy, i continued to test ride and went elsewhere.
Its fascinating to me that the two shops that seem to understand this are owned by manufacturers but don't just stock their own brands. (obviously i haven't been everywhere, but i must have visited about 15 shops on my travels and testing)