Advice for next year

[leevtr]

Hello all,
I know everything for the foreseeable future is subject to this dastardly pandemic that's buggering everything up, but next year I'm going to hit the big 50, and want to do a 3-4 week bike trip to celebrate. I have several things rattling around in my head, but I'd like to hear ideas from those more well travelled than myself. I'm not a novice to biking in Europe, so basic advice isn't required, but if you had to do a trip starting and ending in the UK with my time frame, where would you go. I'm self employed so can pick my time as I see fit, and although my birthday is in late September, I'm open to doing it at a different time of year if the destination climate dictates. I'll be riding a Honda Varadero 1000, most likely 2 up.

Many thanks in advance,

Lee