I feel burnout is unique to every player. Some people not seem to feel it, and others get very hard by it. I myself am likely building up to it a little, but stressful things are happening/coming up in real life so I am using FFXIV as a chill/escape point for as long as I can haha. Do not be afraid to take a brake, you are not giving up on the game if you do not log in for a few days, weeks or even months. Playing other games will help ease the burnout and it helps that unlike other games FFXIV lacks the big FOMO elements that other live service games insist on having nowadays. If you want to still play the game then it could help to do something new, for example a new combat roll (Such as Tank) or try levelling a gathering class. I myself am taking a bit of a levelling break and am now on a hunt to collect as many Triple Triad cards as the game will let me.

Avoiding the negativity of the forums will help too, and keeping in mind that despite the idea that FFXIV is different, every game has such environments and toxicity in their community. It may have gotten worse over the last few years sure, but I have never seen in my twenty plus years of MMO gaming which does not have its share of doomsayers and trolls. Plus whilst I do think Yoshi and the Devs are a bit better then most, they are human and not perfect either. They will be stubborn and mess up just like any other dev. Does not mean the game is going the way of WoW, or that there is no hope for the classes that people are disappointed in.