PnL wise, a lot of firms are starting up coming off a bumper 2020 year. It sounds like fundamentally your problem is being in a bad team/firm that you are not excited to work with. On a good team, you should be getting in to work early feeling pumped that you are all going to smash it today. If you don’t have that feeling, just find a new team.
You mentioned that your partners job is more stressful. Would suggest seeking out a more stressful job for yourself. The low stress jobs in finance are not fun, interesting or lucrative, while the high stress jobs can be all three.
Also, through Brexit, the EU have successfully caused many firms to put Real Jobz in other capitals like Amsterdam, Dublin, or Paris. It sounds like you might enjoy the lifestyle in one of those cities better than London.