Travel tour?

As i know, free and easy is not allow for Japan now.
If you in tour, shall include flight.

2023 Japan might open. 50/50 chances.
BTW, Feb are Hokkaido coolest & most blizzard month. Alot Train will be out of service due to thick snow. Self driving also very difficulty unless you got snow driving experience.
Flight will be also delay due to heavy snow on runway.

Mid of March still very thick snow at outside of Sapporo city.
Train:
Sapporo > Asahikawa 70% good condition
Asahikawa > Biei > Furano 70% good condition
Asahikawa > Abashiri 100% closed due to thick snow.
Asahikawa > Wakkanai 70% chances will closed due to thick snow.
Sapporo to Obihiro & Kushiro 100% closed due to thick snow.

Self Driving. Heading to Wakkanai, Abashiri, Obihiro & Kushiro are not recomemded if you don't have any snow driving experience.
End of March / Early April snow getting thin.
Perfect condition to travel anywhere and enjoy winter activities. Self driving still need pay extra caution, Beware black ice on road.

If you go in March you will miss the winter festival

It will be Blizzard Winter Storm. All Public Transport will be Cancel or delay due to blizzard storm.
From Sapporo to Otaru train as example. Normally should be 20 -25 trip but on Feb only 3-4 trip per daily. Train schedule cut 90%. Sapporo - Otaru Line was most busiest line in entire Hokkaido. The most busiest line also cut 90%, from Sapporo to Asahikawa, Hakodate will be 0%. Totally shutdown due to heavy snow.
Self Driving are only option. Do you have any snow driving experience? Do you know how to put chain in Tyre & take it off when not needed?

This is an example of driving under blizzard storm: