It varies: £15k for three (DH, DS and I) for a safari in Tanzania with Kuoni; £15k for Japan; £9k for Egypt (Cairo, Luxor, Aswan, Nile cruise including flights); £6k for Turkey (Istanbul, Ephesus, Cappadocia, Pamukkale); all costs include flights
I’ve not added up the total cost for our recent trip to Vancouver plus Alaska cruise (balcony room) including staying in Denali National Park, small plane excursion to glaciers, flights to and from UK but would reckon it was around £25k
Costs will also depend on how you travel, we have gotten used to private tours/guides and go for extras such as hot air ballooning, sightseeing helicopter or plane rides, sky diving, tandem paragliding, food tours (eg £400 for three).
Edited to say: well done OP for what you’ve achieved! Enjoy holidays as you please, only you can determine what is worth doing or not