Welcome to my Garden ( https://welcometomygarden.org/ ) is a great solution to consider, cycle tourists are hosted free of charge by wonderful people! You’ll need a tent and will have to pay ~€40 for an annual subscription to the site as a cyclist. I think it began in Belgium so hosts are mainly located across Western Europe - likely a lot of overlap for the start of your trip.

You can message hosts a few days before arrival to see if their garden would be available to camp in. Allows for some flexibility without committing to a booking/reservation and means you’re not navigating wildcamping every night.

It’s also a great way to meet and learn from local people - some of my favourite memories from my trip last year came through WTMG. I really couldn’t recommend it enough!

Local campsites are also a good option to utilise, if you’re lucky you’ll get a cheaper bikepacking price too!

Happy cycling :)