Show product sales on front end

Mike Cameron not sure if this is possible just with Fluent Cart, but I could recommend using FluentCRM with Cart to achieve your goal like so:

Set up tags and integrations for each of your memberships

First create a CRM tag for each of your memberships (e.g "[Subscription] Level 1", "[Subscription] Level 2", "[Subscription] Level 3", etc. Then set up an integration from the relevant subscription product for each membership (e.g apply tag on subscription start, remove tag on subscription end)

Make a custom block/shortcode to display the counts

You can then use PHP to get the number of contacts with the relevant tag. It could go something like so:

<?php
function get_contact_count_by_tag_id( $tag_id ) {
    if ( ! function_exists( 'FluentCrmApi' ) ) {
        return 0;
    }

    try {
        $contacts = FluentCrm\App\Models\Subscriber::filterByTags([$tag_id])->get();
        return count($contacts);

    } catch ( \Exception $e ) {
        error_log( 'FluentCRM Error: ' . $e->getMessage() );
        return 0;
    }
}

$tag_id_to_check = 2; 
$contact_count = get_contact_count_by_tag_id( $tag_id_to_check );

echo "Number of contacts with tag ID {$tag_id_to_check}: " . $contact_count;

By using FluentCRM, you'll also be able to easily send targeted emails to active subscribers for your memberships via the tags.

You'll also be able to see membership growth over time using the tag-wise reporting in FluentCRM.

Feel free to shoot me a community message here if you need some more help!