​​​Lots of good suggestions here. I'd just point out that you need to assess whether you are concerned aboit getting attention of the company and interviewing or whether you are concerned about getting to the line.

If we're talking about hiring. They're looking to see that you're trainable. Just getting a gig at a 135 carrier or regional does this without having you drop money. Again, you can also apply and see what happens.

If we're talking about your confidence in training, then a simulator, renting some planes or whatnot may be worthwhile. A lot of that rides on the nature of things when you left the airlines, whether you had some previous difficulty, etc. None of that needs to be aired out in public here. I'm just saying you know where your head is at and what will probably do it for you.