Nice, I love Judo. I did Judo from age 9 to 22. I'm a brown belt. Its the most beautiful martial art. The name says it all JUDO: the gentle way...here is a gif of me like 20 years ago...
Counter Suplex

Uchi mata

Keep it up, in Judo strength comes from your opponent. Its about using their strength against them. One advice I can give is; if you want the opponent to go left you pull right and they go left, that's when you use their inertia to throw them without using strength...just precise timing. Judo stamina is built mostly in ground work. That's where you use most of your strength. Also, strong forearms are key. Just like basketball, no legs to shot.