Came to London for six months (June - December) last year and loved it, but I was very familiar with the city already due to having visited a ton previously, I already had friends there, etc. Last summer things were open-ish between lockdowns so I was able to meet more people and take advantage of the city a bit more. I have a remote job (and it's been remote since pre-pandemic) so finding work wasn't an issue. I'm moving back in July permanently and have no hesitations about it whatsoever as I think the lockdown will have lifted by then and things will be semi-normal. Then again, I'll still have my job and won't have to look for one. If you don't have a job lined up yet, I'd seriously reconsider moving as it's incredibly expensive.