The MSFS ATC and realism doesn’t fit. 
There are only 2 possibilities left. You use VATSIM or similar. This is realism at its best for the sim.
Second way is, you have a good flight preparation and you know your MSA and transition Altitudes and everything else. Than you can follow ATC until it starts to give you weird instructions. At this point you going to ignore it and follow your flightplan by your own.
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