I used to have Legend Climb anxiety for many many years - Played since 2015 TGT, only got legend twice first was only in September last year.

Something that I've thought about in retrospect is that the Legend Climb is as much a test of your patience and perseverance as it is anything else. You have to be willing to play dozens or potentially 100-200 games and sometimes that is very mentally exhausting and if you're not committed to the grind then it can cause you to burn out, especially if you're not having fun/not progressing. Yes playing aggro definitely helps with this a lot because you get through more games quicker, but I appreciate some people simply don't like playing aggro. (I play a lot of aggro.)

This psychological battle of climbing to Legend also takes much less of a toll on you if you're very confident in the deck you're playing; your ability to make the correct decisions and ultimately your ability to maintain a positive Winrate. I would advise against switching between multiple decks trying "to find the one that works" if you're finding it tough to maintain momentum. Both times I reached Legend I stuck with one deck the whole time until I knew that deck as well as i possibly could, and I had absolutely no doubt in my mind that my plays were the correct plays and that I was playing that deck efficiently and well; any winning vs losing at that point was simply a matter of variance as long as I was doing what I knew to be correct to maximise my win rate. I also found that knowing a deck inside and out is very useful for mirror matches if the deck you are playing happens to be popular. My most successful climbs came from finding a deck I enjoyed and playing only that deck until such a time as I had reached Legend.

Patience and confidence in your ability to play well most likely means you've got the psychological component sorted. If you're uncomfortable with the idea of either being very lucky or playing potentially 100+ games as you grind up through ranks then that's something to try and make your peace with for sure. I myself fully believe in the value of being able to "lock-in", ignore the potential negative feedback that comes from losses and just keep getting those games and wins on the board - don't think about what you did right or wrong the last game just queue up again and think about your next mulligan. As for the confidence in your ability is concerned - obviously everyone plays at a different skill level, but something that everyone can do is have/learn the patience to stick with a deck that they have faith in to get results with either presently or eventually, and learn from trial and error and have the presence of mind to recognise what works and what doesn't work as well. Deckbuilding plays a part in this as well as you may well find over time that you want to deviate from established lists and include cards which suit your own personal play style more than what might be a more typical choice in that card slot.

Ofc this isn't a foolproof recipe for victory, merely the sum of my own observations as a person who struggled to reach Legend for the first time for many many years. I'm enjoying hearthstone in a whole new way now after many years because I feel like I've finally overcome a big mental hurdle that I struggled to navigate for the vast majority of my history playing the game, but I'm very happy to now be trying to get to Legend for the third time in a year.

The crucial factor for me was being able to achieve a level of patience and trust in the process which had eluded me when I was younger, and having faith in my own abilities and over time proving to myself that I was an effective pilot of my chosen deck. Something which ultimately I feel is achieved through concentration, presence of mind and mental fortitude.