Good evening, Carlos, and welcome to the Forum...
Firstly, there is nothing wrong with your bass; changing it for another will do nothing but empty your purse, so forget that, for now. Secondly, please give your location; it helps to know what resources you may have not far from you.
Are you playing through an amp..? Is there any chance of spending just a little of your budget on a couple of lessons with a bass tutor (a real one, not a guitar/bass tutor, preferably...)..? What style of music are you wanting to play (any bands or players you are influenced by..?...).
Have you any bass method books..? The 'standard' 'best buy' recommendation is ...
...the Ultimate Bass Method for beginners, at an unbeatable price. Spiral-bound, so lays flat, and three (yes, three..!) methods in one, to take any player to the level they want to achieve. Highly recommended. Go on; spoil yourself. You know it makes sense...
Amazon.co.uk : Hal Leonards Bass Method...
https://www.amazon.co.uk/Hal-Leonard-Bass-Method-Complete/dp/0793563836/ref=sr_1_1?dchild=1&keywords=Hal+Leonard+Bass+Method&qid=1620574154&sr=8-1
Worth a look..?