Appending params to a form request

Hello guys,

so i have a table with users and i've added some filters with local scopes

User.php

    public function scopeSearch($query, $search)
    {
        if (isset($search)) {
            return $query->where('id', 'like', '%' . $search . '%')->orWhere('name', 'like', '%' . $search . '%')->orWhere('email', 'like', '%' . $search . '%');
        }

        return $query;
    }

    public function scopeSelection($query, $selection)
    {
        if (isset($selection)) {
            switch ($selection) {
                case 1:
                    return $query->withTrashed();
                    break;
                case 2:
                    return $query;
                    break;
                case 3:
                    return $query->onlyTrashed();
                    break;
            }
        }
    }

    public function scopeAmount($query, $amount)
    {
        if (isset($amount)) {
            return $query->paginate($amount);
        }

        return $query->paginate(10);
    }

In my UsersController @ index im calling these filters like this

$users = User::search($request->q)->selection($request->selection)->amount($request->amount);

And in my index.blade.php i have to forms, one for the search field and one for the selection and amount (2 selects)

        <form action="{{ route('users.index') }}" type="get">
            <input class="uk-input uk-width-medium uk-border-rounded uk-box-shadow-small" id="q" name="q" value="{{ isset($_GET['q']) ? $_GET['q'] : "" }}" type="search" placeholder="Suche">
        </form>

                {{-- Form --}}
                <form action="{{ route('users.index') }}" method="GET">

                    {{-- Grid --}}
                    <div uk-grid>

                        {{-- Anzahl --}}
                        <div class="uk-width-1-3">
                            <span>Anzahl</span>
                        </div>
                        <div class="uk-width-2-3">
                            <select class="uk-select" name="amount" id="amount">
                                <option {{ (isset($_GET['amount']) && $_GET['amount'] == 10) ? 'selected' : "" }} value="10">10</option>
                                <option {{ (isset($_GET['amount']) && $_GET['amount'] == 25) ? 'selected' : "" }} value="25">25</option>
                                <option {{ (isset($_GET['amount']) && $_GET['amount'] == 50) ? 'selected' : "" }} value="50">50</option>
                            </select>
                        </div>
                        {{-- /Anzahl --}}

                        {{-- HR --}}
                        <div class="uk-width-1-1"><hr/></div>
                        {{-- /HR --}}

                        {{-- Auswahl --}}
                        <div class="uk-width-1-3">
                            <span>Auswahl</span>
                        </div>
                        <div class="uk-width-2-3">
                            <select class="uk-select" name="selection" id="selection">
                                <option {{ (isset($_GET['selection']) && $_GET['amount'] == 1) ? 'selected' : "" }} value="1">Aktiv</option>
                                <option {{ (isset($_GET['selection']) && $_GET['amount'] == 2) ? 'selected' : "" }} value="2">Inaktiv</option>
                            </select>
                        </div>
                        {{-- /Auswahl --}}

                        {{-- Button --}}
                        <div class="uk-width-1-1">
                            <button class="uk-button uk-button-link uk-text-muted uk-align-right" type="submit"><i class="fas fa-sync-alt"></i></button>
                        </div>
                        {{-- /Button --}}

                    </div>
                    {{-- /Grid --}}

                </form>
                {{-- /Form --}}

For design reasons i cant but them in one form field, now im struggling to append the params to each form. For example when i have set filters for amount and selection the url looks like this

http://localhost/?selection=2&amount=25

But when i then search something with the search field these 2 params will get removed (selection & amount) and the url will look like this

http://localhost/?q=name

How can i append the params to each form submission?

I hope you guys know what i mean, my english isn't the best i know..

Thanks in advance!