This game unfortunately is not designed to be played hard or even mid core for extended periods of time.

I had a guild of 65 ppl about 45 of them quit due the issues you are having, was in the first part of heavensward, game is just not designed for ppl playing 30+hrs a week.

Most the people in my guild now both those who stayed from before and the new ppl have taken breaks or pulled back to 2-3 days a week once savage content is on farm and play other games. FFXIV despite the amount of stuff to do when you look at the whole picture as a newer player, has a massive lack of content problem at current endgame. There has yet to have a patch since 2.0 with truly enough "Relevant Progression" content at endgame for ppl to play this game as a full time mmo. It is one of the main weaknesses of this game and one of the main issues with a casual designed linear themepark in general.

I would suggest trying another game for a bit, if that is not possible for what ever reason I would drop your playtime down to 10hrs a week and play other non-mmo games in between for awhile and then pickup FFXIV game time once the major patches hit and you work to beat content. Doing this will help with burnout and still keep you caught up basically. How FFXIV is designed to be played, love it or hate it.