This is the only information I can find about the setup. Did you lower your temperatures down to high 80s with about a 90* hotspot? I think your enclosure can be improved, what is the substrate; is it loose? More cover would be a good idea, additionally covering 3 sides of the tank would help. Make sure any decorations can’t fall on your gecko.
I’m not trying to be harsh but you shouldn’t get another gecko until you can feed them the right food. Food is likely one of the most important aspects (along with the enclosure) that makes a huge difference in the health of the gecko. The wrong food can kill your gecko while the right foods can significantly increase your geckos lifespan, health, and well-being. If you have trouble getting dubias you could start a colony. With one gecko you could likely feed straight from the colony without waiting for it to get started.
As far as taming it takes patience, try putting your hand in there and leaving it there until he checks it out. Once he checks it out, you can try stroking his back. If he hides and doesn’t come back out just leave and try again the next day, don’t force him out or remove his hide. This may take weeks to do but once he’s comfortable with that you can try picking him up. If he runs just let him hide but eventually (again this will take a while) he will be comfortable enough to handle. Do some research, the search function on here brings up a lot of helpful results. Research how to tame a monitor, tricks for more advanced species can really help with easier species.
If you do get another gecko, don’t buy it from a major chain pet store. They are often unhealthy animals sourced from reptile mills. Source your geckos from a responsible breeder, a local, helpful breeder at an expo can help a lot since you don’t need to ship the gecko and you can ask them questions often. Chain stores information is also harmful.
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