epel-8-release may be 'available', but it think the EPEL 8 repository will take quite some time to be useful; I installed it on a test RHEL 8 system, and using "yum list available" I can only see about 310 packages in the EPEL 8 repo (vs. about 13k packages in EPEL 7).
How to Setup and Configure an OpenVPN Server on CentOS 6 May 02, 2013 How to Install OpenVPN on a CentOS7 VPS - Hostwinds Guides Oct 22, 2019 How to Install and Configure OpenVPN Server with Linux and
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Jul 13, 2020 Install & Configure OpenVPN Server Easy-RSA 3 (RHEL/CentOS
UnofficialOpenvpnSoftwareRepos – OpenVPN Community
Simple Guide to install OpenVPN on CentOS, Ubuntu (& their Feb 27, 2018 VPN Software Repository & Packages | OpenVPN The recommended method to install the OpenVPN Access Server is to use the official OpenVPN Access Server software repository. You will need to be logged on to your Linux system either on the console or via SSH, and have root privileges. Instructions for installing and configuring OpenVPN on CentOS