SHORT HANDS BIG PROBLEMS

Hey guys,

I can't reach #5 key without really struggling :( My issue is that I have based my entire setup on a "10fingersystem" awhile ago I used to play WoW and used this Addon called "Grid" and that was my life saver tbh for healing mainly and well I was hoping if there was something I could do that was similar to that Addon.

TABBING: So I have an issue with that in-game it seems to be random and I can't get it to be accurate enough with it working on LoS also, I just would prefer something easier to use (relates to first paragraph) instead of tabbing :/

And if anyone who is a healer/tank/dd could you maybe give me inspiration for a good layout to have as a healer/tank/dd? I'm in literally at wits end here about it and I could really do with some help!