Gear does not retract - Emergency turn?

[JAR]

PANSOPS Instrument departure procedure:

Procedure design gradient (PDG) unless otherwise published is assumed to be 3.3%

If your aircraft can meet that with gear down then continue with SID

[lifeafteraviation]

There was a whole other thread about this just a month ago

[framer]

1. Continue SID normally (Can you make the required gradient?)
2. Emergency turn (There is one published as you are towards high-ish terrain)

I guess it depends on what aircraft type you are in and what gradient you need.
Eg, in a 737 you will need about 600fpm to make a standard 3.3 % SID.
At 75 tonne and 30 degrees Celcius, gear up you will get about 16% with two 26k engines and 3.8% on one.
With the gear down and two engines you are going to get a lot more than 600fpm so I wouldn't be turning off track in a hurry, even with gear down and one engine inop you can achieve nearly 2%.
But if you are in a Piper Navajo.....different aircraft, different response.
Probably a good idea to sit down and figure out what vertical speed should start ringing alarm bells in the aircraft that you fly.

Would you automatically reach for the "downlock release" button to try and raise the gear?

Again, depends on type, not a good idea in my aircraft if the failure is caused by an air/ground logic fault.
Ps, you won't be rubbish for long if you keep trying to better yourself. I was only rubbish for ten years , now I'm just below average.