Here are some recommendation links from solo board wargame players;

I have also received a huge list of options from a major wargamer of both miniatures and board wargames. Here’s some of his suggestions;
Hi Greg
374 games on here… don’t say I didn’t warn you…
https://boardgamegeek.com/geeklist/295039/solitaire-world-war-2-games
…and thats just WW2…
Some of my favourites from that list:-
https://boardgamegeek.com/boardgame/319746/8th-air-force
https://boardgamegeek.com/boardgame/319747/20th-air-force
https://boardgamegeek.com/boardgame/214161/bastogne
https://boardgamegeek.com/boardgame/296564/drive-suez-rommel-drives-deep-1942 – N Africa!!!
https://boardgamegeek.com/boardgame/150424/ghost-division-7th-panzer-divisions-drive-sea – Rommels 7th panzer – France 1940!
https://boardgamegeek.com/boardgame/352483/lanzerath-ridge – man to man in the Battle of the Bulge – good one this!
https://boardgamegeek.com/boardgame/114261/malta-besieged-1940-1942 – this is excellent
https://boardgamegeek.com/boardgame/171868/miracle-dunkerque-british-withdrawal-france-may-ju
https://boardgamegeek.com/boardgame/361771/race-bastogne-solitaire-wargame – this is a “book” game available on Amazon print on demand – here is the link – https://www.amazon.co.uk/Race-Bastogne-Solitaire-Wargame-Lambo/dp/B09Y9WMDR7/ref=sr_1_1?crid=2K5M95PO8UG6J&keywords=race+to+bastogne&qid=1681249359&sprefix=race+to+bastonge%2Caps%2C70&sr=8-1 a really good investment for £13!
This one isn’t WW2, but by the same game designer, but I real enjoy it, https://www.amazon.co.uk/gp/product/B0B37S8NQ7/ref=dbs_a_def_rwt_hsch_vapi_taft_p1_i9
https://boardgamegeek.com/boardgame/325096/skies-above-britain – just bought one, haven’t played yet, but it is being seriously raved about!
These two aren’t my cup of tea, but they are raved about…
https://boardgamegeek.com/boardgame/337513/warfighter-wwii-north-african-combat-card-game
https://boardgamegeek.com/boardgame/290359/undaunted-north-africa
This however, is my absolute favourite…
https://boardgamegeek.com/boardgame/40209/raf-battle-britain-1940 – you can lose days playing this one!
Most games have a video section, often with unboxings of play throughs; and a Forum section, in which you will find a subsection called Reviews.
Welcome to BoardGameGeek, welcome to the Rabbit Hole of all rabbit holes…
PS – here are some non WW2 solo gems:-
https://boardgamegeek.com/boardgame/42673/field-commander-napoleon
All these by the same designer:-
https://boardgamegeek.com/boardgame/291952/jeff-davis-confederacy-war
https://boardgamegeek.com/boardgame/214758/n-napoleonic-wars
https://boardgamegeek.com/boardgame/192858/mrs-thatchers-war-falklands-1982
https://boardgamegeek.com/boardgame/248928/white-tribe-rhodesias-war-1966-1980
https://boardgamegeek.com/boardgame/252579/gorbachev-fall-communism
https://boardgamegeek.com/boardgame/364346/kaiserkrieg
https://boardgamegeek.com/boardgame/164655/dont-tread-me-american-revolution-solitaire-board
https://boardgamegeek.com/boardgame/99935/keep-fire-boxer-rebellion
https://boardgamegeek.com/boardgame/182409/midway-solitaire
https://boardgamegeek.com/boardgame/242589/nato-air-commander
https://boardgamegeek.com/boardgame/167846/race-baghdad-2003
https://boardgamegeek.com/boardgame/29375/redvers-reverse-battle-colenso-1899
https://boardgamegeek.com/boardgame/23915/solitaire-caesar
https://boardgamegeek.com/boardgame/148471/vietnam-solitaire-special-edition
https://boardgamegeek.com/boardgame/217609/wars-marcus-aurelius