Could you tell me what flashlight and multitool you got?
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Very late answer but I hope is still helpful. I use capture one and Photoshop. On capture one I brought down the shadows quite a bit and controlled the white balanced then on Photoshop I did a levels correction (to adjust what’s the brightest area and what’s the darkest area) and the final touch was adding an overelayed black and white filter where I manually adjust reds, yellows and greens to add contrast to the picture.
I can’t/don’t know the technicalities but I know that a camera body you buy once and update it after 5 or more years so because of that I would go for the A7r III. I’d say youtube videos can help you to understand the differences between those models.