I do not recommend downloading this datapack, I am posting it to hopefully get some help adjusting it so that it will play nicely on a multiplayer server.

It works on a single player world perfectly, but when posted to a multiplayer server, only a few of the scoreboards load and the bossbars arent functioning.

To enable a player, give them a unique tag = p1, p2, ...p20

When running smoothly, a bossbar should appear after mining ore to show progress toward leveling 'Mining'. On a 10 second timer, the bossbar should clear, revealing the whole screen again for smooth gameplay.