One of the very first tweaks I would recommend installing onto your freshly jailbroken iOS 14 device is SnowBoard.
SnowBoard is a lightweight spiritual successor to the legendary WinterBoard theming engine. It works with iOS 7 and up and supports formats from all other popular theming engines. SnowBoard is faithful to the spirit of jailbreaking, and as an essential tool, it is therefore available for free.
Note: A version of SnowBoard is always kept on Dynastic to make it easier to access for some users. However, the latest version of SnowBoard and the SnowBoard Extensions are available on the repo: https://sparkdev.me
To access features such as: masks, icon effects, respring logos, UI theming, and more – add the above repo and install the relevant SnowBoard Extensions. This is done to keep the core of SnowBoard lightweight, and prevent those features being active for users who aren’t interested in them.