Have a look at Qatar for your flights OP. Their business class is award-winning and the connection in Doha is seamless as a business passenger. It literally couldn't get any easier (no messing around getting transits/long walks to terminals as can happen at Dubai, no having to go through security again as happens at Singapore) and as someone suggested upthread, you can always book their Al Maha meet and greet service in Doha and they will literally have someone waiting outside the plane door for you to escort you through the airport, sort out immigration/security etc for you (if you need it). Qatar actually have a separate security/immigration section in Doha for Qatar business passengers. Last time I went through it, I was the only passenger and I was escorted through like a VIP.
I've travelled a lot between the UK and Asia/Aus/NZ and Qatar are now my preferred airline (I've tried pretty much all of them). I really like connecting in Doha as it's so easy. I also enjoy some time to stretch my legs, have a shower and clean my teeth in the lounge, grab a coffee/champagne/snack/3 course meal (!), even do some looking around the shops. When I get on my connecting flight, I feel clean and refreshed.
I used to fly Emirates business and while I like them a lot, Qatar are better and I think more suitable for you as a less confident traveller because of the easy connection at Doha (and the Al Maha service if you want to be looked after the first time to build your confidence up). They also do a lovely Dipthyque amenity kit in business. 
The Covid situation is still a little more complex in Asia so I'd suggest avoid connecting there at present - plus as mentioned already, Doha is a seamless transfer and much easier than Singapore, HK, KL, Bangkok (I used to live in Asia so transited all the major airports with all the major airlines far too many times).
Don't put yourself through the misery of economy. It's harder as a lone traveller in economy as you're stuck sharing space with strangers the entire time. Totally different experience to people flying in economy with family/friends.
Business will give you privacy and space, and ensure you're well looked after at all times - and if there are any issues (such as flight delays etc) you will get priority. And of course then you get priority check-in, fast track security, lounge access, priority luggage (so less waiting when you arrive) etc etc.
I like to sometimes do a stopover on the way back to the UK (but when flying to Aus, I don't like stopovers). It gives you something to look forward to on the way back instead of feeling sad that you're amazing trip is over.