Help with how to seal garage

Moved in to the house recently and need to get the garage sealed as it’s getting colder here. I installed a new weather strip but then I found out that the garage closes right on the lip of the garage…

This causes a poor seal, especially on the sides. I have thought of possibly extending it with concrete or using a rubber ramp but wanted some input from those who are handier than I am!

https://imgur.com/a/QF0ITVK

Bdrl-Hmetoo
1 | 13 hours ago
geriatric_fruitfly
2 | 11 hours ago
MrElendig
1 | 15 hours ago
heisenbugtastic
1 | 10 hours ago