What is the military strategy here for BD to win against Myanmar?
Looking at raw data, Bangladesh Army has 160,000 soldiers vs 400,000 of Myanmar Army. In terms of Air Force, Myanmar has the advantage as well. It operates 30 MiG 29's vs Bangladesh's 8 MiG 29's. The rest are defensive old interceptors that cannot be effectively used in offensive strike roles.
Smaller armies beat much larger armies all the time, that's as old as history. But you need effective tools to achieve your objectives. Like how Israeli's beat the Arab armies, but Bangladesh seems to lack the assets needed.
The most effective way to succeed would be pre-emptive air strikes that cripple the MAF, thus giving BAF air superiority. Allowing the Bangladesh army to move in on the back of a Rohingya uprising that snowballs out of control.
But how does BAF plan to do that? You can't do that with just 8 MiG-29's. Some people are saying BAF is buying 12 Su-27's, but even if you include them, for which there is no proof, it wouldn't be enough. You need to launch several sorties day and night. You need to keep airplanes in the air at all times. Some planes would need repairing, some would need maintenance. Some would malfunction and be out of service until spare parts from foreign countries come in. The pilots would need rest. Some planes would surely be shot down. Some pilots would be killed. What does BAF have to fall back on to sustain that constant pressure? 20 planes are certainly not enough.