You have a typical Spanish accent. The Spanish stress pattern is the most distinctive aspect of your accent. Like many Spanish speakers, you have trouble pronouncing the vowels in the words beet, bit, bat, but, bot, boot and book. However, in general, people will understand you easily.

serrrve - so sweet. As above, your accent is fine. Easily understandable, pleasant. This is what I hear that particularly says "a European accent". Bare in mind, I'm not American, which I guess is the accent you are aiming for, wa'na - probably natural for some areas. go'na shrr - gonna share - tiiiips - tips, as Michael mentions the short "i" ifiiif you'r on-boarrrd - let's get started, ferrst - maybe this is just that "i" sound. . in a miinute . As I said, your accent is not unpleasant. Unless you want to work in a call centre and pretend to be from just down the road, why change it?

This is perfectly understandable English. Well done. You don't have the sound or intonation of a native speaker - very few non native speakers do - but you will be clearly understood by most people, most of the time. A particular issue for many people, including you, is the English short "i" sound. If you can master this, it will help you. :) If you can't find better sources, something from these links might help. https://www.englishclub.com/pronunciation/minimal-pairs-i-ee.htm https://www.britishcouncil.org/voices-magazine/how-english-learners-can-improve-intonation https://www.lucalampariello.com/sound-like-a-native-speaker/ https://pronunciationstudio.com/7-tips-british-english-pronunciation/