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Rather than rebuilding the URL from scratch, you could take the page’s current URL and only modify the parameter that was updated in the dropdown.
function changestore(){
var filterstoregen = document.getElementById("filterstoregen").value;
let params = (new URL(window.location)).searchParams;
params.set('storename', filterstoregen);
window.location.search = params.toString();
}
function changeday(){
var filterday = document.getElementById("filterday").value;
let params = (new URL(window.location)).searchParams;
params.set('dayname', filterday);
window.location.search = params.toString();
}
Source:stackexchange.com