Does the field you’re looking to get in to require any knowledge of hydraulic systems and circuits? Control systems? i.e. Hoe to move kit around using a hydraulic power supply, logic circuits, valves and cylinders?
Can you produce fabrication drawings with your choice of CAD package?
Without knowing you (personally, or on the forum) if you’ve come from a research or academic field then you might find that your skillset is more in line with what they’d expect from a Graduate Engineer and you need to pitch yourself lower and expect to advance quickly rather than go straight in at Design or Mechanical Engineer level.
Hope this is useful and not condescending, apologies if it comes across that way!
/edit – to confirm what some the less sarcy posts above point out, is that the scope for a ‘Mechanical Engineer’ can very enormously.