If you're located in the UK and are hoping to offer payment installments, I'd recommend either PUT IT ON LAY-BUY or Splitit Monthly Payments. You should be able to find both of these under Settings > Payments > Alternative payment methods > Choose alternative payment.
In regards to the loss in sales, you may be interested in taking a look at our resources for businesses impacted by COVID-19 here. Are you having trouble driving traffic to the site, or do you find that there is traffic without it converting to sales?
Shop Pay installments will only be available for merchants based in the US upon the original launch, though we hope for this to be expanded in the future. In the meantime, you can use other payment installment options available to you in your payment gateway settings. The options for Canada can be seen here (Pay over time with Klarna, PUT IT ON LAY-BUY, and Splitit Monthly Payments). You can add these options under Settings > Payments > Alternative payment methods. Hope that helps!
Thanks so much for the detailed feedback - that is really helpful, and I'll be sure to pass it on to the appropriate team. Have you taken a look at the Affirm gateway at all? This is another option available for Canadian merchants, and I believe they offer the ability to buy now and pay later: https://www.affirm.com/.