jQuery is a set of utility functions, you first need to recognize the functions you really need from jQuery. So if you need:
- ...
.ajax()? there is the native .fetch
- ... query elements in DOM with
$('selector')? you can use document.querySelector or document.querySelectorAll
- ... event listeners? you could use the native
addEventListener or a more lightweight library such as github.com/dgraham/delegated-events
....
PD: I'm not saying jQuery is a bad thing, it is just that browsers and/or standards have evolved