What do you mean without fighting strategically? My loses were all strategical. It was back in early GF mechanics, where GF Dance was a valid strategy, win or lose, and elite items were useless against stronger opponents with over +10 to damage over me.
There are some players that fought very strategically to bring their wins back from a 2:1 ratio deficit. I had to win over 20 fights in order to get 1:1 ratio, and then even more to get 2:1.
1) Save X-items for 3-4 months until people run out of them
2) Moving is a very good strategy, it forces the opponent to react, so you can predict what they'd do and surprise them
3) Predict grenades throws and make your opponent miss with yours
I did this when I first began and I have +0 extra damage fighters win against me multiple times as well. When your opponent runs out of a weapon, you either move towards or away from them, forcing them to switch weapons. Once they're switched, you move back causing your opponent to miss and land your own hit. They lose a turn having to switch weapons again. You can do this multiple times and it depends if your opponent is fighting strategically or not.
A lot of people have bad records because they don't know how to fight strategically even though there are people who had disadvantages and managed to get a lot of wins because of it.