I had some trouble understanding this without the text.
The most important thing to work on is your prosody - your intonation. Once you get this right, it will make a huge difference. A good way to do this is to listen to English news bulletins, etc. without concentrating too much on the content, but just listening to the cadences and phrasing.
You've stressed some words wrongly: devastating, not devastating, pursue ...
Try to shorten the short 'i' even more in words like 'simple' and 'thing'. On the other hand, 'believe' requires a longer /i:/.
Some of your consonants are not very clear. The /d/ and /t/ need to be strong alveolar consonants, not the Spanish dental consonants.
Well, that's probably enough for you to start on.