I'm sure it's not possible to upgrade the builtin display, so the only option is to use an external display.
The 1000D does not have an HDMI interface, just an analogue video out, which supports PAL and NTSC video. I'm not sure there are displays for this an if, what the price is.
The 1000D also has no WiFi. Sure, there are WiFi SD-cards, but from SD-cards, you can only load already taken photos.
I would suggest to use a mobile phone app which connects to the camera via USB. The phone needs to support USB OTG which means it is not only a "device" being connected to a "computer", but can act itself as "computer" where "devices" can be connected. Most modern android mobiles support this for Apple, I don't know.
An app can not only download already shot photos, it can also act as life view display with its full resolution including magnification, and as trigger. It is also possbilbe to set the focus and all the other usual settings, and even more. For example, the camera itself allows to take three photos with different settings for HDR photos, while an app can take... well, as many as you want.
On the other side, a mobile phone attached to the camera via cable is not practical, and you need a tripod. But an external monitor isn't much better.
Finally, it would be interesting to know why your photos are unsharp. I own a 700D and in automatic mode I used the first days, the camera guessed what to put in focus, and was wrong more often than right. So, how do you take your photos? (Maybe, you have an example?)