Sorry to say it OP but it is extremely unlikely that Canada will open its borders to international visitors by April. Federal government has completely fumbled covid vaccinations right from the start, and are now in full-on panic mode since absolutely nothing is going the way they thought it would. There is zero chance of this being completely sorted in the next two to three months. At present, you can't even board a flight to Canada without providing a negative covid test first, and are still subject to a 14-day quarantine here upon arrival even if your test is negative.
I strongly suggest you take a refund and try again in 2022. Sorry for the negativity, but that is reality. Things may begin to open up by late summer, my gut feel is it will be late Q3 or Q4 before international travel is realistic.