What about Simple:Press Forum?

         Simple:Press is a comprehensive and feature-packed forum plugin designed to seamlessly integrate with WordPress, providing a robust platform for creating and managing forums. With full support for PHP 7.4 to 8.2, it ensures top-notch performance and scalability for large user bases

From plugins repository

Key Features

• Enterprise-grade performance, scalable for thousands of users
• Seamless integration with WordPress user and security models, featuring a robust user group and permission system
• SEO optimized for enhanced search engine visibility
• Highly customizable and extendable for a tailored experience
• Data import compatibility with other forum platforms, such as bbPress and Asgaros
• Multi-level forum structures with subforum support
• Options for both private and public forums
• Fully theme and template driven for easy customization
• Selection of adaptable themes with customizable colors and font sizes to match your brand identity
• Extensive administration options and settings for streamlined management

From plugins repo 

Simple:Press Pro

Take your forum to the next level by adding Simple:Press Pro, a bundle of add-ons that bring over 100 additional features to your forum.Some of the included add-ons are:

• Analytics: Engaging charts displaying forum data
• Ads: An advanced advertising engine integrated within the forum
• Private messaging system: Enables users to exchange private messages
• Push Notifications: Supports SMS, Pushover, PushBullet, and Slack
• Reputation System
• Polls
• Admin Bar: Front-end management tool for admins and moderators, eliminating the need for wp-admin access
• Image, media, and file uploader: Allows designated users to upload files and media to topics and posts
• Multiple post editors, including TinyMCE
• Who’s Online

View all add-ons and pricing .